A few scenes throughout where the main character is mistaken as a pervert. Walking in on his sister showering, accidentally looking up some skirts, standard anime comedy.

Merry's outfit shows significant skin and the camera sometimes lingers on her midsection. No pantyshots or other fanservice comes of it though.

Lots of bloodless fights, as the series progresses it tonally becomes darker and the fights are more intense.

Some mild swearing in the English dub, damn, bastard, hell, bitch, ect.

As the series progresses it gets darker. The villain and some of the dream world imagery can be frighting,