- Audience-Alienating Premise: This show openly romanticizes the romantic and sexual relationships between schoolchildren and their young adult teachers.
- Broken Base:
- Does Kei's technical adulthood make their relationship with Mizuho permissible? Or is it just an authorial trick to make romantic and sexual relationship between a schoolboy and a teacher less scandalous?
- Not many people liked that Spin-Off simplifies the identity of many characters before the almost open Flanderisation.
- Cult Classic: It's no wonder, given that it the most popular or almost the only anime about Teacher/Student Romance.
- Fridge Brilliance: The Pixellation on the object in Hatsuo's hand in the OAV is a wonderful use for misdirection purposes. It helps steer the viewer's perception in the wrong direction by concealing that it was most likely just the device she used to tie him down.
- Fridge Logic - Based on what Maho and Mizuho remember about their father, Maho may actually have been born first, although Mizuho is clearly older physically and emotionally. (How space travel affects the rate at which the various travelers age is never really much explained or discussed, but it's hinted that there is some time dilation.)
- Possibly bolstering this theory, Ichigo tells Kei her little sister passed her by while she was comatose, growing up and getting married while Ichigo remained stuck in adolescence.
- Moe: Most of the characters, especially Mizuho.
- Sequelitis: Onegai Twins is much less known and popular than the this show, as a much weaker story pushed the audience away. The role played also was that Teacher/Student Romance was obviously a more acceptable fetish for the audience than Twincest, though implicit. At the same time, surprisingly averted with the reboot Waiting in the Summer, which was positively received by critics and is considered "at the level of the original."
- Tear Jerker: The reason for Kei's "standstills". He failed to prevent his older sister's suicide and was forced to watch as she plunged to her death.
YMMV / Please Teacher!