History Manga / NandeKokoNiSenseiGa

[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/sensei_kv.jpg]]
[[caption-width-right:350:Seriously, Why are they Here!?]]

''Nande Koko ni Sensei ga!?'' (translated as ''"Why the Hell are you here, Teacher!?"'') is an ongoing {{Ecchi}} [[RomanticComedy Romantic]] SexComedy manga by Soborou. An animated adaptation has been released in Spring 2019.

Kana Kojima, a high school Japanese language teacher at Kawanuma West, is famous for being a "demon teacher." However, in front of high school student Ichirou, she seems to be air-headed and clumsy, and he keeps finding himself in perverted situations with her in places like the in men's bathroom, in the men's bathhouse, in the pool, at the school infirmary, and elsewhere.

And they're not the only ones, with several students finding themselves in perverted situations with their teachers.
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!!General Tropes
* AccidentalKiss: It doesn't happen as often as "[[SuggestiveCollision accidental groping]]" but it does happen to more than one couple.
* AccidentalPervert: ''Every'' male protagonist finds himself in a compromising position with his respective teacher, almost always exposing or touching something.
* AdaptationalEarlyAppearance: The anime has Rin and Mayu, the second couple from the manga, show up in the first episode. Mayu even replaces the unnamed generic teacher from the second chapter of the manga.
* AdaptationalExpansion: The bonus 13th episode of the anime is based on the omake chapter of the 4th volume, but instead of focusing solely on Tachibana and Tanaka, it also shows what the previous three couples were doing during that time.
* AlliterativeName: Nearly every character. '''K'''ana '''K'''ojima, '''Ma'''yu '''Ma'''tsukaze, '''H'''ikari '''H'''azakura, '''Sa'''ki '''Sa'''tou, '''Taka'''shi '''Taka'''hashi, '''Wata'''ru '''Wata'''nabe, and '''I'''zumi '''I'''nokawa. The seventh volume even introduces '''Yama'''to '''Yama'''moto and '''Ouka''' '''Oka'''moto.
* AloofDarkHairedGirl: Izumi Inokawa, the teacher of the sixth volume, has long dark hair, wears dark clothes and has a quiet and rather creepy demeanor.
* ArtShift: Anyone can look normal one second and have an exaggerated and cartoonishly wacky facial expressions in the next, and the series has a wide variety of them, most of which involve BlankWhiteEyes.
* AscendedExtra: Mayu's little sister Saya was introduced as a supporting character with infrequent appearances in volumes 2 and 3. Come volume 5, and she is now part of the central LoveTriangle of the volume, effectively being promoted to main character status.
* AssShove: Satou is forced to give Kana a suppository when she gets a cold. Making matters worse, since he was blindfolded to let Kana keep her dignity, the first try was... “not successful.”
--> [[CountryMatters “No, not *that* hole...]] stupid... further up!”
** The next day when Satou gets her cold, Kana returns the favor when she finds out he pretended to be sick to skip class. And she's ''not'' gentle about it.
* BlindingBangs: Chizuru's hair usually covers her right eye, signifying her hidden side.
* ChildProdigy: Homura is 16 years old, yet she already has a Bachelor's degree and had various research papers published. Volume 5 starts with her becoming a Language Teacher for students of her age.
* ComicBookTime: Subverted, the LoveTriangle story arc in Volume 5 takes place a short time after the other three which happen concurrently, Mayu is stated to have recently married Suzuki, so there wouldn't be any obvious signs of aging.
* TheComicallySerious: Most of the comedy of volume 4 is derived from how Chizuru's seriousness doesn't fit the {{Ecchi}} nature of the manga.
* ContrivedCoincidence: How the plots of many chapters start; the opening narrations of the main characters show they are just as incredulous as the audience. They usually begin with "This is X. I'm sure this is X. Then ''why is Teacher here!?''" with the teacher of the volume ''somehow'' being in the same room as them, in spite of how unlikely that is.
* CoolBigSis:
** Mayu is Saya's older sister and is one of the nicest teachers, but is a bit less mature than Saya.
** Izumi has a younger brother and really tries to cheer him up during an athletic meet.
* CouchGag: In the anime, the start and end of the opening credits and the full ending credits change to showcase the "main" teacher of the current arc which includes a DoItYourselfThemeTune ending done by said main teacher.
* CurtainsMatchTheWindow: Quite a few characters have eyes that match their hair color. Mayu, Chizuru and Ouka are some examples.
* DarkIsNotEvil: Inokawa has long black hair, wears dark clothes and has a creepy demeanor about her, which freaks her students out. But deep down she's really just a sweetheart who's trying to do her best as a teacher and getting to know her students.
* DefrostingIceQueen:
** Downplayed with Kana. Although she does mellow out over time, she still retains her demon persona.
** Chizuru is famous for her emotionless demeanor, but after interacting with Kou, her personality becomes slightly more expressive.
* TheDreaded:
** Kana is known as "Kojima the Demon Teacher" for her strict teaching that even delinquents are scared of her.
** To a lighter degree, Inokawa is known as the "Stalker Ghost" for doing extensive research on her students and revealing that she knows much more about them than they feel comfortable with.
* EasilyForgiven: Most of the awkward situations end with the guys apologizing profusely and the teachers dismissing it as an accident, although there are exceptions.
* EmotionlessGirl: Chizuru is believed to be this by all of her students (thus her nickname "Absolute Zero"). In reality, she has emotions like any other person, but [[TheStoic they don't show in her face most of the time]].
* EyePoke: Ichiro tries pulling this on Rin when they both see Kana in a swimsuit at the local pool, except Rin is wearing a pair of glasses. When they see Mayu wearing a swimsuit, it's Kana who does this to Ichiro.
* FaceOfAThug:
** Not only is Rin very tall for his age, but his face seems to instinctively switch to a glare whenever he is unsure of how to approach people. At the start of Volume 2, Satou is his OnlyFriend because he is the only one who knows he is a NiceGuy inside.
** Kana herself can fall into this whenever she has an intimidating glare, which is enough to make babies cry.
* ForgottenFirstMeeting: Satou met Kana when she was a teenager, and he was a kid. Satou forgot their meeting, but Kana never did (although she didn't realize that the kid she met was Satou), prompting for him wondering if he's the reason why she is known as "Kojima the Demon Teacher."
* FromBadToWorse: Just about every chapter is structured this way. Once a teacher falls into some kind of embarrassing situation with a student, the student's efforts to get them out of it or make things right only makes it worse. They'll accidentally grab their clothes or underwear and take them off, have the teacher fall on top of them just to be grabbed in the worst possible spot, or risk exposing them in front of others. It all works out in the end, though. Somehow.
* {{Gainaxing}}: Ouka has this problem whenever she runs. We see this when Yamato is tasked with teaching her AlterEgo Sakura how to properly run on a treadmill, and again in a flashback which shows her annoyance at the boys who notice her when jogging.
* GenderBender: One of Nana's many inventions is a drink and pill that changes a person's genitals into the opposite sex for a brief time. Tadashi is given the pill variant when he tries to convince Kurumi that he's not the man she fears he is [[spoiler: and fails because of how quickly it wears off]], and Kurumi is later treated to the pill variant when she visits his school, needs to use the restroom, and nearly gets caught herself.
* GentleGiant: Rin is huge for his age, but he is just as nice as any of the other guys.
* HasAType: Kojima's criteria for men involves a younger man who can take care of people, and can get along with kids. Satou (un)fortunately fits all three of these criteria.
* HotTeacher: This is the whole point of the story since all the female teachers have killer bodies.
* HotterAndSexier:
** Normally each couple gets ten chapters for themselves. But sometimes the author publishes "extra chapters" outside of that count. Those chapters are pretty much guaranteed to be even more explicit than the usual chapters.
** The main story also becomes much more daring in how far it can take the {{Fanservice}} starting with the LoveTriangle arc in volumes 8-10. Some chapters in those volumes are bordeline softcore porn.
* HugeGuyTinyGirl: Rin and Mayu share this dynamic, as he's the tallest of the male protagonists, while Mayu is among the shortest teachers.
* IAmNotPretty: Neither Chizuru nor Izumi consider themselves very sexy. Kou and Wataru would easily tell you otherwise.
* InSeriesNickname: At least 5 of the teachers have earned one: "[[SternTeacher Kojima the Demon]]" for Kana; "[[SenseiChan Matsukaze the Saint]]" for Mayu; "[[TheStoic Absolute Zero Tachibana]]" for Chizuru; "[[DarkIsNotEvil Inokawa the Stalker Ghost]]" for Izumi; and "[[{{Tomboy}} Prince Kurisu]]" for Kurumi.
* JumpScare: Happens in the seventh volume when Ouka gazes upon Yamato practicing to win her over, and Izumi pops out from behind her, scaring the daylights out of the pop idol teacher.
* LetsWaitAWhile: After getting together, the Omake chapters show that [[spoiler: Kana and Izumi]] aren't ready to go all the way with their new boyfriends. Not that it doesn't stop the former from fantasizing about it.
* LikeBrotherAndSister: Before becoming romantically involved, this was Hikari and Takashi's relationship, Takashi even calling Hikari "Hika-nee" in private, being ChildhoodFriends due to both of them being in families where both parents worked. Their first episode is all about how both [[ShesAllGrownUp have changed]].
* LivingADoubleLife: Ouka Okamoto isn't just a new teacher in the seventh volume, but her AlterEgo is an airheaded PopIdol named Sakura Okamoto, and she doesn't want her students or fans to connect the dots.
* LoveTriangle:
** The fifth volume differs from the previous four by having three main characters: The obligatory male main character Yorito, ChildProdigy Homura, and Mayu’s younger sister Saya. The TeacherStudentRomance theme is preserved despite them all being around the same age because Homura has just become a teacher and Saya used to tutor Yorito in daycare.
** While each volume revolves around one couple, Volume 8 marks a huge change for the series by dedicating three volumes around {{Bishonen}} Tadashi Nakamura and the two teachers that fall for him: {{Tomboy}} Kurumi Kurisu and MadScientist Nana Nanjou. Volume 8 shows how the two teachers begin to fall for him, and when Tadashi is asked which one he likes at the end, the story splits into two paths: Volume 9 is the "Nanjou Path" and Volume 10 is the "Kurisu Path". While Tadashi appears in all three volumes, Kurumi only appears briefly at the beginning of Nanjou's path, and vice versa for hers.
* MissConception:
** Kana admits that she's not an expert on sex and it shows. In one of the early omake chapters, she accidentally trips and goes down on Satou, and tells him they should start thinking of names for the baby. Considering there was no actual intercourse involved, he's baffled.
** To lesser degree, Izumi [[spoiler: goes down on Wataru in her omake chapter because she believes that couples do it to relieve their stress and nervousness, not because of any physical stimulation involved]].
* NiceGirl: Mayu is known in her school as the kindest and most tolerant teacher.
* NiceGuy: All the male main characters are this to some extent. It plays a major role in them getting the interest of a HotTeacher.
* NoSocialSkills:
** Chizuru has no idea of how she is supposed to interact with her students.
** Izumi has a tendency to pop up out of nowhere and bring up the darkest secrets of her students.
* NotSoDifferent: One of the reasons the students and teachers become closer to the other is because it's revealed that they have more in common than they realize. Kana and Satou are both unpopular with others, Hikari and Taka aren't as mature as they'd like to think, Izumi and Wataru [[spoiler: both didn't attend classes]], Ouka and Yamato [[spoiler: tried to outdo the other to deem themselves worthy of each other]], and Kurumi and Tadashi both get mistaken for the opposite sex.
* OddFriendship:
** Kojima is seen as the scariest teacher in the school and has zero popularity with the students, while Mayu is seen as the kindest and is the most popular. The two are good friends.
** Similarly, Chizuru goes to Hikari when she needs advice on how to get closer to her students, despite their personalities being polar opposites.
* OhCrap: ''All over the damn place''. There are too many incidents to count where the teachers and students end up causing each other trouble, and their attempts to remedy the situation only makes it worse. It's mostly from the students when they accidentally grope their teachers or cause them to lose their clothes, but the teachers are prone to this as well as a result of their clumsiness.
* OlderThanSheLooks: Mayu looks like she could be Rin's classmate, or maybe even his younger sister, but not his teacher.
* OneDegreeOfSeparation: The {{Rotating Protagonist}}s are all connected through a net of relationships that gets more and more implausible as the series goes. The first set of protagonists Satou and Kojima are friends with the second set of protagonists, Rin and Mayu, respectively. Those two then go to another school to work in a combo event, and the teacher-student pair they meet there – Hikari and Takashi – also get romantically involved with each other. Then the series introduces Kou, the former student council president of Takashi's school who went to the same junior high school as Satou and Rin, and who also gets in a relationship with his teacher Chizuru, who happens to be friends with Hikari. And after all that, a ChildProdigy becomes a teacher in the first school, is introduced to the students by Kojima, and gets involved in a LoveTriangle between herself, Mayu's younger sister Saya, and another student called Yorito, with all three of them being ChildhoodFriends. It continues on from there, with each new couple being connected to a character from the previous volumes in some way or another.
* OnlyFriend: Satou is this to Rin at the start of volume 2. He tries to distance himself from Rin a little in part because he wants some alone time with Kojima, and in part because Satou wants Rin to make more friends so Rin won't become reliant on him.
* PottyEmergency: Some of the situations involve one of the teachers being stuck in a bad position, and it goes FromBadToWorse when they have to use the restroom and are nowhere near one. Or if they are, it's usually the men's restroom and they risk getting caught.
* PottyFailure:
** The very first story ends this way. When Satou finds himself trapped in the boys' restroom with Kojima (who was using it since the woman's restroom was being cleaned), after everything that happens, the poor guy can't hold it in and we're reminded of the reason he came into the restroom in the first place.
** Homura suffers from this in Chapter 42, which reminds Yamato that she was the same young foreign girl from many years before who peed herself, since she didn't know enough Japanese at the time to ask where the restroom was. Both times, he soaks her in water before anyone could learn what really happened, making it look like [[CruelToBeKind he had pulled a mean prank on her instead]].
* RagingStiffie: A frequent gag, and most of the guys try to hide it out of embarrassment.
* ReiAyanamiExpy: Chizuru. She has pale hair, is introduced as an EmotionlessGirl, and her character arc is about learning how to interact with others as she gets closer to Kou.
* RomanticComedy: The stories are filled with cute and romantic elements, and the ridiculousness of the {{ecchi}} situations and wild reactions from everyone makes it funnier than one would expect.
* RotatingProtagonist: Every volume of the series focuses on a different couple. The previous main characters never disappear, but they are reduced to a [[DemotedToExtra supporting role]].
* RuleOfSexy: The series will often ignore the laws of physics and even common sense for the sake of getting attractive female teachers in erotic situations with their male students.
* SenseiChan: All the teachers aren't that old when compared to their students, and most of them have dorky traits.
* SexComedy: Many of the embarrassing situations the teachers and students have together are PlayedForLaughs because of how unexpected things happen, and their efforts to get themselves out of it only makes it worse.
* SexyDiscretionShot: Occurs in the omake chapter between [[spoiler: Chizuru and Tanaka after they get together. It turns out she accidentally took him to a love hotel, and after things go wrong in the bathroom, she suggests they try again and get it right. The next morning reveals they had sex, but it wasn't as pleasant as Chizuru hoped]].
* SexySantaDress: Chizuru spends Christmas with Kou wearing one of these. She really likes Christmas.
* ShipperOnDeck: Satou's mother ships her son with her old friend Kana.
* SternTeacher: Kana "The Demon" Kojima. Rumors say she is stern even with the parents of her students.
* TheStoic: What Chizuru is, rather than the EmotionlessGirl her students believe her to be. She has had trouble expressing her emotions since she was small.
* SuckOutThePoison: Ichiro attempts this on Kana when she gets bitten while swimming at the beach, in the worst possible spot. [[spoiler: She passes out, but not because she was poisoned, but because he hit the wrong spot]].
* SugarAndIcePersonality:
** Kana is feared by nearly everyone around her, but her encounters with Satou reveal she's shy and clumsy.
** Chizuru is most of the time calm and aloof, but her sweet side comes into view when interacting with Kou.
* SuggestiveCollision: It's impossible for the characters to bump into each other and not get themselves entangled in each other's assets.
* TanLines: As expected of a swimming teacher, Hikari has several tan lines.
* TeacherStudentRomance: The underlying premise for each arc, with the respective pairing becoming closer as their story progresses.
* TitleDrop: Many chapters start with the male main character asking the same question from the title, or some variation of it.
* {{Tsundere}}:
** Kana starts as mostly harsh, but after enough incidents with Satou, she becomes mostly sweet.
** Homura is stated to be one, but her difficulty with being upfront with her feelings unintentionally keeps her on the "tsun tsun" side.
** Ouka acts coldly toward Yamato, but it's only a front because she can't be upfront about her real feelings for him due to being a teacher and an idol.
* YoungerThanTheyLook: Rin. When he and Mayu first met, she believed that he was older than her, and was shocked when she learned that he was still a student.
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* {{Adorkable}}: Most of the teachers have at least one defining trait that puts them into this category. Kana is afraid of lightning and can be rather clumsy, Mayu still buys meals that include toys, Chizuru writes her name on everything she owns, and nearly everything about Izumi when her true side shows.

* SenseiChan: All the teachers aren't that old when compared to their students, and most of them have {{Adorkable}} traits.

* HotterAndSexier: Normally each couple gets ten chapters for themselves. But sometimes the author publishes "extra chapters" outside of that count. Those chapters are pretty much guaranteed to be even more explicit than the usual chapters.

* SexyDiscretionShot: Occurs in the omake chapter between [[spoiler: Chiruzu and Tanaka after they get together. It turns out she accidentally took him to a love hotel, and after things go wrong in the bathroom, she suggests they try again and get it right. The next morning reveals they had sex, but it wasn't as pleasant as Chizuru hoped]].

* InSeriesNickname: At least 4 of the teachers have earned one: "[[SternTeacher Kojima the Demon]]" for Kana; "[[SenseiChan Matsukaze the Saint]]" for Mayu; "[[TheStoic Absolute Zero Tachibana]]" for Chizuru, and "[[DarkIsNotEvil Inokawa the Stalker Ghost]]" for Izumi.

* LoveTriangle: The fifth volume differs from the previous four by having three main characters: The obligatory male main character Yorito, ChildProdigy Homura, and Mayu’s younger sister Saya. The TeacherStudentRomance theme is preserved despite them all being around the same age because Homura has just become a teacher and Saya used to tutor Yorito in daycare.

* OneDegreeOfSeparation: The {{Rotating Protagonist}}s are all connected through a net of relationships that gets more and more implausible as the series goes. The first set of protagonists Satou and Kojima are friends with the second set of protagonists, Rin and Mayu, respectively. Those two then go to another school to work in a combo event, and the teacher-student pair they meet there – Hikari and Takashi – also get romantically involved with each other. Then the series introduces Kou, the former student council president of Takashi's school who went to the same junior high school as Satou and Rin, and who also gets in a relationship with his teacher Chizuru, who happens to be friends with Hikari. And after all that, a ChildProdigy becomes a teacher in the first school, is introduced to the students by Kojima, and gets involved in a LoveTriangle between herself, Mayu's younger sister Saya, and another student called Yorito, with all three of them being ChildhoodFriends. It continues on from there, with each new couple being connected to a character from the previous volume in some way or another.

* ComicBookTime: Subverted, the LoveTriangle story arc takes place a short time after the other three which happen concurrently, Mayu is stated to have recently married Suzuki, so there wouldn't be any obvious signs of aging.

* FromBadToWorse: Just about every chapter is structured this way. Once a teacher falls into some kind of embarrassing situation with a student, the student's efforts to get out of it or make things right only makes it worse. They'll accidentally grab their clothes or underwear and take them off, have the teacher fall on top of them just to be grabbed in the worst possible spot, or risk exposing them in front of others. It all works out in the end, though. Somehow.

* MissConception: Kana admits that she's not an expert on sex and it shows. In one of the early omake chapters, she accidentally trips and goes down on Satou, and tells him they should start thinking of names for the baby. Considering there was no actual intercourse involved, he's baffled.

* OddFriendship:

* OneDegreeOfSeparation: The {{Rotating Protagonist}}s are all connected through a net of relationships that gets more and more implausible as the series goes. The first set of protagonists Satou and Kojima are friends with the second set of protagonists, Rin and Mayu, respectively. Those two then go to another school to work in a combo event, and the teacher-student pair they meet there – Hikari and Takashi – also get romantically involved with each other. Then the series introduces Kou, the former student council president of Takashi's school who went to the same junior high school as Satou and Rin, and who also gets in a relationship with his teacher Chizuru, who happens to be friends with Hikari. And after all that, a ChildProdigy becomes a teacher in the first school, is introduced to the students by Kojima, and gets involved in a LoveTriangle between herself, Mayu's younger sister Saya, and another student called Yorito, with all three of them being ChildhoodFriends. The next pair has Wataru being co-workers with Satou at a convenience store, and Ouka becomes a teacher at the same school where Izumi works at.

* YoungerThanTheyLook: Rin. When he and Mayu first met, she believed that he was older than her, and was shocked when she learned that he was still a student.

* FromBadToWorse: Just about every chapter is structured this way. Once a teacher falls into some kind of embarrassing situation, the student's efforts to remedy the situation only makes things worse. They'll accidentally grab their clothes or underwear and take them off, have the teacher fall on top of them just to be grabbed in the worst possible spot, or risk exposing them in front of others. It all works out in the end, though. Somehow.

* FromBadToWorse: Just about every chapter is structured this way. Once a teacher falls into some kind of bad position, no matter what the student tries, their attempts to remedy the situation only makes things worse. They'll accidentally grab their clothes or underwear and take them off, have the teacher fall on top of them just to be grabbed in the worst possible spot, and it's not uncommon to have objects fall right into their underwear. And it just so happens that people are nearby and they risk getting caught. It all works out in the end, if not miraculously.

** The very first story ends this way. After he finds himself trapped in the boys' restroom with Kojima (who was using it since the woman's restroom was being cleaned), we're reminded why he came to the restroom in the first place and fails to hold it in.
** Homura suffers from this in Chapter 42, which reminds Yamato that she was the young foreign girl from many years before who couldn't hold it in since she didn't know enough Japanese to ask where the restroom was. Both times, he soaks her in water before anyone learns what really happened, giving the appearance that he pulled a cruel prank on her instead.

* {{Gainaxing}}: When Yamato is tasked with teaching Sakura how to properly run on a treadmill, this is what happens.

* JumpScare: Happens in the seventh volume when Izumi pops out of nowhere, scaring the daylights out of Ouka.

* RotatingProtagonist: Every volume of the series focuses on a different couple. The previous main characters never disappear, but they are reduced to a supporting role.

''Nande Koko ni Sensei ga!?'' (translated as ''"Why the Hell are you here, Teacher!?"'') is an ongoing {{Ecchi}} RomanticComedy manga by Soborou. An animated adaptation has been released in Spring 2019.

* EvolvingCredits: In the anime, the start and end of the opening credits and the full ending credits change to showcase the "main" teacher of the current arc which includes a DoItYourselfThemeTune ending done by said main teacher.

''Nande Koko ni Sensei ga!?'' (translated as ''"Why the Hell are you here, Teacher!?"'') is an ongoing {{Ecchi}} manga by Soborou. An animated adaptation has been released in Spring 2019.

* SuckOutThePoison: Ichiro attempts this on Kana when she gets bitten while swimming at the beach, in the worst possible spot. [[spoiler: She passes out, but not because she was poisoned, but because he accidentally went completely in]].

* AccidentalKiss: It doesn't happen as often as "[[SuggestiveCollision accidental groping]]" but it does happen. To more than one couple.

* ArtShift: Anyone can look normal one second and have an exaggerated and cartoonishly wacky face expression in the next, and the series has a wide variety of them, most of which involve BlankWhiteEyes.

* AlliterativeName: Nearly every character. '''K'''ana '''K'''ojima, '''Ma'''yu '''Ma'''tsukaze, '''H'''ikari '''H'''azakura, '''Sa'''ki '''Sa'''tou, '''Taka'''shi'' '''Taka'''hashi, '''Wata'''ru '''Wata'''nabe, and '''I'''zumi '''I'''nokawa. The seventh volume even introduces '''Yama'''to '''Yama'''moto and '''Ouka''' '''Oka'''moto.

* AlliterativeName: Nearly every character. '''K'''ana '''K'''ojima, '''Ma'''yu '''Ma'''tsukaze, '''H'''ikari '''H'''azakura, '''Sa'''ki '''Sa'''tou, '''Taka'''shi'' '''T'''hashi, '''Wata'''ru '''Wata'''nabe, and '''I'''zumi '''I'''nokawa. The seventh volume even introduces '''Yama'''to '''Yama'''moto and '''Ouka''' '''Oka'''moto.

* AlliterativeName: '''K'''ana '''K'''ojima, '''Ma'''yu '''Ma'''tsukaze, '''H'''ikari '''H'''azakura, '''Sa'''ki '''Sa'''tou, '''T'''akashi '''T'''akahashi, '''Wata'''ru '''Wata'''nabe, and '''I'''zumi '''I'''nokawa. The seventh volume even introduces '''Yama'''to '''Yama'''moto and '''Ouka''' '''Oka'''moto.

* ComicBookTime: Subverted, the LoveTriangle story arc takes place a short time after the other three which happen concurrently, Saya is stated to have recently married Suzuki, so there wouldn't be any obvious signs of aging.

* OneDegreeOfSeparation: The {{Rotating Protagonist}}s are all connected through a net of relationships that gets more and more implausible as the series goes. The first set of protagonists Satou and Kojima are friends with the second set of protagonists, Rin and Mayu, respectively. Those two then go to another school to work in a combo event, and the teacher-student pair they meet there – Hikari and Takashi – also get romantically involved with each other. Then the series introduces Kou, the former student council president of Takashi's school who went to the same junior high school as Satou and Rin, and who also gets in a relationship with his teacher Chizuru, who happens to be friends with Hikari. And after all that, a ChildProdigy becomes a teacher in the first school, is introduced to the students by Kojima, and gets involved in a LoveTriangle between herself, Mayu's younger sister Saya, and another student called Yori, with all three of them being ChildhoodFriends. And then, the next pair has the male half being co-workers with Takashi at a convenience store.

* SuckOutThePoison: Ichiro attempts this on Kana when she gets bitten while swimming at the beach, in the worst possible spot. [[spoiler: She passes out after Ichiro hits the wrong spot, and it turns out that she wasn't poisoned]].
* SugarAndIcePersonality: Chizuru is most of the time calm and aloof, but her sweet side comes into view when interacting with Kou.

* ForgottenFirstMeeting: Satou met Kana when she was a teenager, and he was a kid. Satou forgot their meeting, but Kana never did, prompting for him wondering if he's the reason why she is known as "Kojima the Demon Teacher."

* AlliterativeName: '''K'''ana '''K'''ojima, '''Ma'''yu '''Ma'''tsukaze, '''H'''ikari '''H'''azakura, '''Sa'''ki '''Sa'''tou, '''T'''akashi '''T'''akahashi, '''Wata'''ru '''Wata'''nabe, and '''I'''zumi '''I'''nokawa.
* AloofDarkHairedGirl: Izumi Inokawa, the teacher of the sixth volume, has long dark hair, wears black clothes and has a quiet and rather creepy demeanor.

** Kojima is seen as the scariest teacher in the school and has 0% popularity with the students, while Mayu is seen as the kindest and is the most popular. The two are good friends.

* SuckOutThePoison: Ichiro attempts this on Kana when she gets bitten while swimming at the beach, in the worst possible spot. [[spoiler: It turns out that while she was bit, she wasn't poisoned]].

** Homura is stated to be one, but her difficulty with being upfront with her feelings intentionally keeps her on the "tsun tsun" side.

* EyePoke: Ichiro tries pulling this on Rin when they both see Kana in a swimsuit, except Rin is wearing a pair of glasses. When they see Mayu wearing a swimsuit, Rin pulls this on Ichiro and succeeds.

** Mayu is Saya's older sister and is of the nicest teachers, but is a bit less mature than Saya.

* DarkIsNotEvil: Inokawa has long black hair, wears black clothes and has a creepy demeanor about her, which freaks her students out. But deep down she's really just a sweetheart who's trying to do her best as a teacher and getting to know her students.
* DefrostingIceQueen: Chizuru is famous for her emotionless demeanor, but after interacting with Kou, her personality becomes slightly more expressive.

* FaceOfAThug: Not only is Rin very tall for his age, but his face seems to instinctively switch to a glare whenever he is unsure of how to approach people. At the start of Volume 2, Satou is his OnlyFriend because he is the only one who knows he is a NiceGuy inside.

* NoSocialSkills: Chizuru has no idea of how she is supposed to interact with her students.

** Homura is stated to be one, but her difficulty with being upfront with her feelings intentionally keeps her on the "[=TsunTsun=]" side.

* AlliterativeName: '''K'''ana '''K'''ojima, '''Ma'''yu '''Ma'''tsukaze, '''H'''ikari '''H'''azakura, '''Sa'''ki '''Sa'''tou, '''T'''akashi '''T'''akahashi, '''Wata'''ru '''Wata''nabe, and '''I'''zumi '''I'''nokawa.

* EvolvingCredits: The start and end of the opening credits and the full ending credits change to showcase the "main" teacher of the current arc which includes a DoItYourselfThemeTune ending done by said main teacher.

* InSeriesNickname: At least 4 of the teachers have earned one: "[[SternTeacher Kojima the Demon]]" for Kana; "[[SenseiChan Matsukaze the Saint]]" for Mayu; "[[TheStoic 'Absolute Zero' Tachibana]]" for Chizuru, and "[[DarkIsNotEvil Inokawa the Stalker Ghost]]" for Izumi.

* AlliterativeName: '''K'''ana '''K'''ojima, '''Ma'''yu '''Ma'''tsukaze, '''H'''ikari '''H'''azakura, '''Sa'''ki '''Sa'''tou and '''T'''akashi '''T'''akahashi.

* TheDreaded: Kana is known as "Kojima the Demon Teacher" for her strict teaching that even delinquents are scared of her.

* HugeGuyTinyGirl: Rin is much taller than Mayu.
* InSeriesNickname: At least 3 of the teachers have earned one: "[[Main/SternTeacher Kojima the Demon]]" for Kana; "[[Main/SenseiChan Matsukaze the Saint]]" for Mayu; and "[[Main/TheStoic 'Absolute Zero' Tachibana]]" for Chizuru.

** Kojima is seen as the scariest teacher in the school, while Mayu is seen as the kindest. The two are good friends.

* {{Tsundere}}: Kana starts as mostly harsh, but after enough incidents with Satou, she becomes mostly sweet.

* AlliterativeName: '''K'''ana '''K'''ojima, '''M'''ayu '''M'''atsukaze, '''H'''ikari '''H'''azakura and '''T'''akashi '''T'''akahashi.

* OneDegreeOfSeparation: The {{Rotating Protagonist}}s are all connected through a net of relationships that gets more and more implausible as the series goes. The first set of protagonists Satou and Kojima are friends with the second set of protagonists, Rin and Mayu, respectively. Those two then go to another school to work in a combo event, and the teacher-student pair they meet there – Hikari and Takashi – also get romantically involved with each other. Then the series introduces Kou, the former student council president of Takashi's school who went to the same junior high school as Satou and Rin, and who also gets in a relationship with his teacher Chizuru, who happens to be friends with Hikari. And after all that, a ChildProdigy becomes a teacher in the first school, is introduced to the students by Kojima, and gets involved in a LoveTriangle between herself, Mayu's younger sister Saya, and another student called Yori, with all three of them being ChildhoodFriends.

* EvolvingCredits: The start and end of the opening credits and the full ending credits change to showcase the "main" teacher of the current arc.

* EvolvingCredits: The start and end of the credits change to showcase the "main" teacher of the current arc.