Early in the show a man draws a nude woman. Seen for a few seconds from some distance, so it can be easily missed.

There is a beach scene in the episode 5. We see a lot of men and a few women in the swimsuits. It is brief and not sexual at all.

In the start of episode 6 a half-naked woman can be seen on the poster on the wall in the boys' locker room. Very briefly.

Barely, if at all, any sexual references are to be found.

Some tissues are at a clothed man's bedside, although it is unclear if he used them to cry and/or masturbate.

It is mentioned that a student is suspended for violence. We briefly see him punch and kick a man from a distance, with no real blood/detail.

Occasional mild to moderate coarse language ('damn', 'hell', 'ass', 'dick', 'bitch', 'shit') in the English dub and official subtitles.

The old table tennis coaches are seen smoking somewhat regularly.

A young man is intoxicated by "Whiskey Bonbons," and is seen stumbling around the outdoors (this is not portrayed in a good light).