There are fantasy/dream sequences at show two character being intimate with each other. Character uses these "dreams" to masturbate.

Kazuya sometimes falls in suggestive positions with some of the girls

Kazuya accidentally grabs Ruka's and Chizuru's breasts

Ruka often talks about taking her relationship to the next level.

A pack of condoms fall out of a girls bag while she is staying the night over.

The main character is a pervert and he has moments where he analyzes and talks about the girls bodies and sexual features. This happens often in the series and is a little uncomfortable to sit through.

Character sometimes wear revealing clothing that shows cleavage.

There is a a beach episode and you can see Mami and Chizuru in skimpy bathing suits.

Kazuya compares Chizuru and Sumi's chest size.

There are some panty shots.

There is a several shower and bath scenes with not breat nudity and no lower nudity but infrequent you can see bare buttocks.

In the first episode, Chizuru kicks Kazuya in the balls.

Sometimes characters are acting out violence for a play or show.

All the characters are adults so they swear quite a bit but no f-bombs or worse.

Main characters friends smoke and consume alcohol in beach episode and at a restaurant . It's brief but some characters are drunk.

Characters get hangovers.

A majority of the characters can legally drink.

Mami is two-faced and she has a serious side that is a little unsettling.