- Adaptation Displacement: Most people were introduced to the series through the anime rather than the games and very few know about the light novels.
- Evil Is Sexy: Yoru at first.
- Launcher of a Thousand Ships: Sora in games; he has Shinichirou, Nanami, Chris, Hiromi, Sunao, Ran, Matsuri, and others.
- Sunao as well, Sora, Yoru, Ran, Matsuri, Shinichirou, and Nanami all care deeply about him to the point where they can ship him with them. Also in the manga, Sunao attracted some guys when he was dressed in his Swam Lake costume, they even thought he was a girl and offered to rub his chest to make his breasts bigger.
- Nightmare Fuel: Sunao in episode 11
- Shipping/Shipper on Deck: Done in-show by Matsuri a lot.
- Tear Jerker: The knife stabbing.
- Viewer Gender Confusion: Though Nanami's gender is established as male very early, even the English subtitles mix it up in one episode.