A lot of panty shots. In an episode is about physical examinations and has a lot of assumed sexual stuff, the girls do not wear bras in this episode, the most extreme sexual thing in this episode is probably when a male doctor listens to Ayano's heart, and she moans sexually, and tries to show the doctor her breasts but he tells her not to. Another episode where they are at the pool, Eriko's bra gets untied and her teachers (who accidentally hit on her and her friend) see her bare breasts

Eriko thinks that her buff male teacher is seducing her in an episode. In an episode where the girls are wearing bloomers, a pervert takes a picture of Eriko's butt, her teacher accidentally pull down her bloomer, revealing her panties, also, Ayano's boyfriend sees her eating a banana and gets dirty minded and, I bet you can figure out what happens next. In a flashback, Eriko makes fun of Yuma's bra.

A lot of panty shots.

Eriko's bloomer gets pulled down, revealing her panties, in the same episode a pervert takes a picture of her butt

Ayano's boyfriend, Shimotakatani, gets a nose bleed (anime expression that means perverted) when Ayano eats a banana

Ogawa almost gets seduced in a love hotel

Eriko makes fun of Yuma's bra in a flashback

The girl's teacher sometimes gets caught making gay remarks about himself, the series teacher accidentally sees Eriko's bare breasts, and panties

Kouda ties her cape into a bra in hopes of making her breasts larger

Some people consider the series a "hentai", which is extremely sexual anime

Ayano moans when a male doctor listens to her heart, she also talks about showing him her bare breasts

A pervert takes a picture of Eriko's butt

Kouda admits to being a lesbian

Kouda gets a tampon stuck in her vagina and digs it out with a pencil

Some bad language and sexual innuendos are said

Eriko cries over an injection (not illegal, but some might still find it inappropriate

Eriko overhears Kouda practicing an audition, which leads to her and her friends thinking that Kouda is about to die