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Manga / Nande Koko Ni Sensei Ga

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Seriously, Why are they Here!?

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.

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.


General Tropes

  • Accidental Kiss: It doesn't happen as often as "accidental groping" but it does happen. To more than one couple.
  • Accidental Pervert: Every male protagonist finds himself in a compromising position with his respective teacher, almost always exposing or touching something.
  • Adaptational Early Appearance: 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.
  • Alliterative Name: Kana Kojima, Mayu Matsukaze, Hikari Hazakura and Takashi Takahashi.
  • Ascended Extra: 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 Love Triangle of the volume, effectively being promoted to main character status.
  • Ass Shove: 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.”
    “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.
  • Blinding Bangs: Chizuru's hair usually covers her right eye, signifying her hidden side.
  • Child Prodigy: 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.
  • Comic-Book Time: Subverted, the Love Triangle 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.
  • The Comically Serious: Most of the comedy of volume 4 is derived from how Chizuru's seriousness doesn't fit the Ecchi nature of the manga.
  • Contrived Coincidence: 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.
  • Defrosting Ice Queen: Chizuru is famous for her emotionless demeanor, but after interacting with Kou, her personality becomes slightly more expressive.
  • The Dreaded: Kana is known as "Kojima the Demon Teacher" for her strict teaching that even delinquents are scared of her.
  • Emotionless Girl: 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 they don't show in her face most of the time.
  • Evolving Credits: 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 "Do It Yourself" Theme Tune ending done by said main teacher.
  • Face of a Thug: 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 Only Friend because he is the only one who knows he is a Nice Guy inside.
  • Forgotten First Meeting: 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."
  • Gentle Giant: Rin is huge for his age, but he is just as nice as any of the other guys.
  • Has a Type: 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.
  • Hot Teacher: This is the whole point of the story since all the female teachers have killer bodies.
  • Hotter and Sexier: 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.
  • Huge Guy, Tiny Girl: Rin is much taller than Mayu.
  • In-Series Nickname: At least 3 of the teachers have earned one: "Kojima the Demon" for Kana; "Matsukaze the Saint" for Mayu; and "'Absolute Zero' Tachibana" for Chizuru.
  • Like Brother and Sister: Before becoming romantically involved, this was Hikari and Takashi's relationship, Takashi even calling Hikari "Hika-nee" in private, being Childhood Friends due to both of them being in families where both parents worked. Their first episode is all about how both have changed.
  • Love Triangle: The fifth volume differs from the previous four by having three main characters: The obligatory male main character Yorito, Child Prodigy Homura, and Mayu’s younger sister Saya. The Teacher/Student Romance 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.
  • Nice Girl: Mayu is known in her school as the kindest and most tolerant teacher.
  • Nice Guy: All the male main characters are this to some extent. It plays a major role in them getting the interest of a Hot Teacher.
  • No Social Skills: Chizuru has no idea of how she is supposed to interact with her students.
  • Odd Friendship:
    • Kojima is seen as the scariest teacher in the school, while Mayu is seen as the kindest. 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.
  • Older Than She Looks: Mayu looks like she could be Rin's classmate, or maybe even his younger sister, but not his teacher.
  • One Degree of Separation: The Rotating Protagonists 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 Child Prodigy becomes a teacher in the first school, is introduced to the students by Kojima, and gets involved in a Love Triangle between herself, Mayu's younger sister Saya, and another student called Yori, with all three of them being Childhood Friends.
  • Only Friend: 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.
  • Rei Ayanami Expy: Chizuru. She has pale hair, is introduced as an Emotionless Girl, and her character arc is about learning how to interact with others as she gets closer to Kou.
  • Rotating Protagonist: Every volume of the series focuses on a different couple. The previous main characters never disappear, but they are reduced to a supporting role.
  • Rule of Sexy: 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.
  • Sensei-chan: All the teachers aren't that old when compared to their students, and most of them have Adorkable traits.
  • Shipper on Deck: Satou's mother ships her son with her old friend Kana.
  • Stern Teacher: Kana "The Demon" Kojima. Rumors say she is stern even with the parents of her students.
  • The Stoic: What Chizuru is, rather than the Emotionless Girl her students believe her to be. She has had trouble expressing her emotions since she was small.
  • Sugar-and-Ice Personality: Chizuru is most of the time calm and aloof, but her sweet side comes into view when interacting with Kou.
  • Suggestive Collision: It's impossible for the characters to bump into each other and not get themselves entangled in each other's assets.
  • Tan Lines: As expected of a swimming teacher, Hikari has several tan lines.
  • Teacher/Student Romance: The underlying premise for each arc, with the respective pairing becoming closer as their story progresses.
  • Title Drop: 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.

Example of: