As an anime about drawing and art there often can be sketches of human anatomy but nothing sexual.

One scene when a boy is in the show but it's from the waist up so nothings shown.

There are some infrequent references to gravure magazines, boys going to see "sexy" movies, and boys getting "excited."

Some mild comic slapstick.

A boy is punched in the face in one scene, though there are consequences for the attacker. We briefly see a wound on his face afterwards.

A kid is stabbed with a pencil as a joke no violence or gore.

Occasional mild language like damn or hell.

In one episode, Saiko says the word: "Bull" as in bullshit but he doesn't say the rest.

Some infrequent references to adults drinking and going on cigarette breaks. No actual smoking is seen from the underage characters, and no intoxication is depicted during the brief scenes in which adults go out drinking.