Very mild sexual innuendos in some episodes, In the OVA Episode all the characters wear swimsuit

The main male protagonist occasionally glances at the main female protagonist's chest and/or cleavage. Is usually only brief and mild at that.

The end credits feature a pair of young girls (probably around freshmen age) wearing very skimpy, nearly see-through negligees while laying on their backs on a large cushion. As the music plays, the camera pans over their faces, torsos, (including a pass over the chest area) and arms. Neither girl resists, instead submitting to the attention. A clear cut example of fanservice.

None.

None

In one episode, a side-character is heavily-implied to have been smoking in a classroom.

The main female protagonist passes out from eating whiskey chocolates in one episode. Is comedic in nature.

When investigating mysteries, the characters will sometimes gather around and share their theories on what they think may've happened. These theories are usually wild and gruesome, and are usually accompanied by visual portrayals. For example, in one episode, a girl imagines a corpse hanging by a noose. Fortunately, the truth of these mysteries tends to be a lot milder and these wild theories are never true. Also, while still disturbing, these portrayals are highly artsy and stylized.