Mild innuendos and sexual references throughout.

A character often gets mistaken for a girl and is forced to cross-dress for various reasons at several points in the show despite showing discomfort to the idea.

A character is shown wearing excessively revealing clothes through most of the series, though she is often scolded for it and it's intended for laughs.

Occasional references to pornography including depictions of characters reading porn magazines, though nothing graphic is shown.

Two characters are continually called perverts. One character is extremely sexual (fan service).

In an episode where all the students come up with call signs/nicknames for each other, one girl complains about her nickname being "Scrunchies and boobs."

A female character asks a male character how she looks in a tube top that exposes a lot of cleavage. The close up on her chest lasts a couple second. The male character is very pleased, though the female character doesn't understand why.

A female character has her cellphone hidden in her cleavage. She gasps in surprise when it rings and her breasts jiggle in a brief closeup.

A female teacher forcibly kissed a male student for a prolonged amount of time to get information out of him as he comedically freaks out.

While going through solo pictures of students, one character in a picture is running around nude. No graphics.

A character on an island goes nude to join his (female) classmates who are playing in the ocean. Nothing happens at all.

A character has an aversion to huge breasts.

One character gets shoved into a female's chest from "hugging". He says something along the lines of "Stop it! I can't breath because of your enormous ta tas"

In an episode, a boy kisses a girl to put her mind away from assassination. This lasts for about 40 seconds.

Teacher shows a photo of a naked male student. The tie covers the frontal part.

A female character try's to please a male to try to kill him, but the male changes her at quick speed. No changing was seen. And she tells the student,"He also had time to do the thing", nothing is referred or talked about it,and it gets dropped easily.

Nothing too bad other than one character having slight cleavage however she gets teased for this and soon enough wears no cleavage.

There are several bloody scenes throughout the series, though they are all brief.

A character peels off the skin on his face, but he is only a yellow alien so it is non graphic

A man is stabbed in the eye. Blood gushed everywhere (done in a very cartoony manner, so it probably won't appear disturbing to most).

A running gag involves the students calling their teacher either "Professor Bitch" or "Bitch Sensei" (depending on the version you watch) due to her last name.

A couple uses of bastard and crap. In a later episode there is a bleeped out f-word (both broadcast and uncut versions are bleeped). This is played for laughs.

"Prick" and "dick" are used frequently

Language are uses frequent like "Hell", "Damn", "Ass/Dumbass", "Piss", "Bitch/Son of a bitch", "Shit/Bullshit".

Occasional infrequent depictions of smoking and alcoholic beverages, but nothing more than that.

Mentions of drug selling concerning gangs

A female teacher smokes in one episode, this is not shown again.

The entire plot of the series revolves around a class trying to assassinate their teacher.

Whilst many characters use silly methods of trying to kill their teacher some chatacters are very tense and even experience bloodlust towards him or other students.

Some scenes can seem a bit intense, dark, or even depressing to some viewers.

The first episode is not straight forward at all, the story at first glance may seem confusing or even dark.