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Kei Kusanagi, an OrdinaryHighSchoolStudent, has just seen an alien.

Problem is, she's just announced herself as his new Homeroom teacher, Mizuho Kazami. And she just moved in next door.

And the last time he saw her, she tried to [[LaserGuidedAmnesia wipe his memory of her existence]].

One would think a situation like this would not end well, but a few hijinks later they end up married after Kei reveals that he's [[OlderThanTheyLook older than he looks]] to prevent [[NotWhatItLooksLike a potentially compromising situation]] from being taken [[HotForStudent the wrong way]]).

Unfortunately, now they have to keep his age, her origins, and their marriage a secret from Kei's friends, which is going to be difficult, as one of them is starting to get aggressive in trying to catch Kei's attention.

''PleaseTwins'' is a SpinOff involving different characters at the same school. ''AnoNatsuDeMatteru'', the third anime series of the franchise, is either a sequel or a reboot with new characters.

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!!''Please Teacher!'' contains examples of:

* AccidentalPervert: Kei can't help but see up Ichigo's skirt when she catches him trying to hide on a stairway. Naturally she [[TheUnfairSex teases him for it]].
* AlienNonInterferenceClause: along with a rare example of a protagonist being punished for violating it
* AngstComa: They have the power to suspend aging.
* AnticlimacticParent
* BeachEpisode: Episode 5, which is also Kei and Mizuho's honeymoon. No one they know is supposed to be there, but of course, Kei's friends and one of the other teachers all just also happened to be there as well...
* BlandNameProduct: Famous Brands such as "Pochy". A poster for the movie [[{{Titanic}} Titania]] can also be seen in episode 4.
* BromanticFoil: Hyosuke
* ButNotTooForeign: Kaede is one quarter Irish.
* ChainedToABed: Happens to Kei in the OVA
* ClingyJealousGirl
** Konoha, Kei's aunt, acts this way too whenever her husband talks about how jealous he of Kei's romances. She usually hits him since he often says it within hearing range of her.
** Maho isn't too happy that her sister Mizuho is married to Kei either. Although she accepts his relationship later, she steals a kiss from him, while in sight of Mizuho. Mizuho responds by [[CryCute crying]].
* ConverseWithTheUnconscious: Happens ALL the time, once with Kei to [[spoiler:Ichigo]], and quite frequently, Mizuho to Kei [[spoiler: due to Kei's AngstComa disorder]].
* CryCute: Mizuho looks so adorable when she's crying.
* DatePeepers: Mizuho spies on Kei during his "date" with Koishi. Ichigo and Kaede also spy on them separately.
* DeliberatelyBadExample: Parodied and {{Lampshaded}} with Matagu.
* DespairEventHorizon: For Kei, it's the cause of his AngstComa disorder. For Ichigo, it's one of the effects. Triggered by their sisters in both cases.
** For Ichigo, [[spoiler: it was coming out of her long coma to discover her little sister was now a married adult.]]
** For Kei, [[spoiler: it was watching his older sister commit suicide by jumping off the school roof.]]
* DoubleStandardRapeFemaleOnMale: Okay it doesn't go as far as actual sex and she was trying to add spice to Kei's life with Mizuho but in the OVA Hatsuho forces Kei to go with her to a love hotel and ties him to a bed while looming over him with something that looks suspiciously like a dildo while he makes his displeasure clear. Were the genders reversed this would be ''very'' creepy.
* DudeHesLikeInAComa: Mizuho kisses Kei for the first time while he's in a standstill (it was Kei's first kiss too!)
* {{Ecchi}}: This goes to extremes and very ''very'' ''VERY'' close to hentai in the epilogue episode. So close that anyone that forgets that this isn't an H-anime would probably be disappointed.
* EmotionlessGirl: Ichigo appears to be so, but she has her reasons...
* EyesAlwaysShut: Kei's Aunt
* FanService: Clearly. One look at the title character, and no arguments can be made.
* FirstGirlWins: [[spoiler: Mizuho]]
* HalfHumanHybrid: Mizuho and Maho.
* HappilyMarried: Subverted, but eventually affirmed as Kei and Mizuho's initially rocky relationship slowly develops
* HenpeckedHusband: Minoru, Kei's uncle. Any time he mentions being jealous of Kei's romances, his wife tends to hit him.
* HeroesWantRedheads
* HopelessSuitor: Poor [[spoiler: Koishi. Her only possible chance would've been to act in episode 1, but after that, it's obvious who Kei is going to have to end up with.]]
* HotForTeacher / HotForStudent: played both ways and not just by the characters you'd expect.
* HotTeacher: Guess who.
* HumanAlien / InterspeciesRomance: While it's never made clear which trope is in play, Mizuho's half-human ancestry implies the former.
* IChooseToStay: You knew it would come to this
* IllBoy: Played with: Kei's AngstComa disorder is not debilitating or life-threatening but they have to keep it a secret because it could unravel all of their other secrets as well. It does worry Mizuho every time he keels over, though.
* InnocentFanserviceGirl: Perhaps not fully applied given as how each remotely attractive female on the show (that is to say, all of them) has at least some idea of the influence her looks have, but there are plenty of times where they don't realize the effect they have.
* LittleMissSnarker: Ichigo.
* LoveHotels:
* LoveObstructingParents: zigzagged
** Mizuho's little sis Maho is the very model of [[ObnoxiousInLaws Obnoxious In Law]]. Meanwhile, her mom Hatsuho...
* MarriageBeforeRomance: Kei Kusanagi marries the alien who is posing as his home room teacher in order to protect her secret identity. They move in together and quickly fall in love with each other.
* TheMatchmaker: Ichigo
* ModernStasis: Although it's stated that it's years since the first manned mission to Mars in 2009, the world at large still looks like the present.
* MomentKiller: You'll lose track of how often this happens.
* NotWhatItLooksLike: Used at least [[OnceAnEpisode once]] (if not more) in practically ''every single episode.'' Not to mention that it basically fuels the plot 90% of the time. (The rest of the time it ''is'' what it looks like and they have to pretend it isn't.)
* OlderThanTheyLook: Kei and Ichigo
* ParentalAbandonment: Kei and Ichigo, though it's less abandonment than mutual estrangement.
* ParentsWalkInAtTheWorstTime: Your aunt and uncle do, anyway; such as when you've just [[ItMakesSenseInContext accidentally teleported into their bathtub with the hot new teacher]] in the rather skimpy tights with open cleavage that make up her space uniform, and your legal guardians there were just about to take a bath in that same tub. To make things worse, the startled Mizuho then seizes up in panic and starts screaming while [[MarshmallowHell shoving Kei's face into her cleavage]].
* PersonalSeals
* {{Pixellation}}
* PrimalScene: Done for Maho for ''humor'', possibly due to alien biology causing her to be OlderThanTheyLook. She makes ''films'' of Kei and Mizuho's night life and blackmails him using them. Apparently Hatsuho doesn't know this as she does ''the exact same thing'' when she sets them up in a Love Hotel and Maho says she wants to see the video chips, which the former says are for "adults only."
** An alternative possibility is that Maho ''didn't'' film anything, but Hatsuho told her to blackmail Kei by pretending she had. Maho is shown later asking Hatsuho why her scheme was so elaborate that she actually had a script for it, to which her mother's reply is also rather cryptic. Maho may not have had any idea what was actually supposed to be on the video chips she showed Kei.
* PurelyAestheticGlasses: Mizuho in teacher mode. An Onegai trademark.
* RelationshipUpgrade: Happens to [[spoiler: Kaede and Hyosuke]]
** In the manga version: [[spoiler: Ichigo and Hyosuke]]
* ResetButton: [[spoiler: The Federation forces everyone to forget Mizuho and puts Earth under a quarantine. Mizuho sneaks back and breaks through Kei's WistfulAmnesia. Then they get to redo their relationship from the beginning, with the implication that it all went much smoother this time.]]
* SadisticChoice: Mizuho, forced to choose between Kei and her career, makes an impassioned plea to be allowed both on humanitarian grounds. She's convicted of violating the AlienNonInterferenceClause instead.
* SecretRelationship: Kei and Mizuho can't be open about their marriage largely because it'll be seen the [[TeacherStudentRomance wrong way]] by both the faculty (aside from the principal who already knows but tells the two not to openly show feelings for each other in public), and Kei's friends. HilarityEnsues a lot due to this trope.
* ShipperOnDeck: Ichigo does this for Kei and Koishi. And later Kaede and Hyosuke.
* ShoutOut: To [[GetterRobo Shin Getter Robo Vs. Neo Getter Robo]], of all things.
* StrongFamilyResemblance
* TeacherStudentRomance: Obviously the title characters and the plot of the series. Furthermore, they get away with this because not only is Kei really 18 (and therefore legally old enough to marry the teacher), the ''school principal'' married a student as soon as she graduated and sympathizes with them. [[DoubleStandard Kei gets creeped out]].
* TheThreeFacesOfEve: The heroine, Mizuho, is obviously the "[[YamatoNadeshiko sensible and capable]]" Wife, her "[[BrattyHalfPint innocent childlike]]" sister Maho is obviously the Child, and the "HotterAndSexier" Hatsuho is the Seductress, despite the fact that she's their mother.
* TokenMiniMoe: Ichigo
* TrademarkFavoriteFood: Mizuho's "Pochy" sticks.
* TwentyMinutesIntoTheFuture: Mizuho's human father was a member of the first attempted manned Mars mission, which is stated to have occurred in 2009. Assuming she ages the same as normal humans, the earliest this series could take place would be the early 2030s.
** Which is weird due to the apparent lack of [[TechnologyMarchesOn cellphones]].
* WistfulAmnesia: Kei just can't shake the feeling that something (or someone) is missing from his life.
* XMeetsY: WordOfGod states that this show is [[DustinHoffman Dustin Hoffman's]] ''TheGraduate'' meets ''My Stepmother Is An Alien.''

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