Most episodes are fairly tame, but there are a few exceptions. In one episode the main character comments on a little girl's mother about being "hot".
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(Deleted. Personal opinions about content are not appropriate for the Parents Guide.)
very short scene of children bathing, nothing is seen
Two girls, age 11 and 13, try to seduce a 15 year old boy into having sex by getting naked (no detail is shown, but plenty of "fan service"). Later that night the 11 year old repeats and re-enforces the attempt by jumping on top of the boy while still naked and trying to cast a spell to lure him into having sex with her. Highly inappropriate in most cultures.
A buxom 13-year old barmaid is pointed out (in the main character's mind) as being "especially well developed for a 13 year old". Her peasant-top bust is focused on repeatedly during the episode, including her pressing her breasts visibly and suggestively against him.
During the entire series the sexuality/attractiveness of minors is focused on.
A 15 year old boy is depicting visiting a brothel. He's later chided by an 11 year old girl, angry that he'd visit a brothel when she was there "beautiful and willing".