none.

A teacher sometimes wears suggestive costumes she makes.

There are bath scenes but not much detail shown.

Infrequent slapstick.

Infrequent mild language.

An adult character smokes, she clearly states she wants to quit, becoming a running gag.

The protagonist has a fever dream in episode 5, potentially showing some disturbing dream imagery for younger audiences.

The series is heartwarming and wholesome overall.