Mild comic violence.

A character receives an injury in one episode that is implied to be very bloody, however is blurred out.

Adult characters are seen socially drinking.

The lead character is scolded for smoking (despite being an adult) by a teacher due to his youthful appearance in the first episode.

Although it is more of a comical anime, it has some mildly emotional moments.

A woman commits suicide after being harassed by her fellow employees. No one in the office (despite the main character) cares that she committed suicide. This can be upsetting.