None. Sometimes there are bathing scenes but they only last for a few seconds and show nothing.

No violence. This show is very chill and nothing inappropriate ever happens.

Very mild. Some words are said but they aren't rude or bad in any means.

Nothing to be concerned about.

Nothing sad or frightening ever happens.

People need to know that the whole Aria series has a rather melancholic and dream-like tone and ambience to it. Some episodes (talking about the series as a whole) have very surreal and confusing sequences.