Nanaka 6/17/YMMV
- Moral Event Horizon (Crossed by 17-year Nanaka in tome 10 of the manga ; she goes Yandere and tries to double-suicide with Nenji by jumping off a cliff and pulling an unsuspecting Nenji with her ; doubles as a Crowning Moment of Awesome for Amemiya and both of Nanaka's Split Personalities who come to their rescue ; and after the event, Amemiya gives 17-year Nanaka a What the Hell, Hero? speech, an Armor-Piercing Slap, and an awesome Hannibal Lecture for what she did. Fortunately, 17-year Nanaka gets better as a person after this event ; but the trope is still on effect as, on the other hand, she loses all credibility as a potential Love Interest for Nenji, since starting from this event, he finally begins making his mind and eventually chooses Amemiya.)
- Nightmare Fuel (Volume 9 of the manga, page 75 : the Flash Back scene showing Nenji, back when he was a violent Delinquent, litterally beating to a pulp another delinquent, all while pulling a real creepy Slasher Smile, with a terrified Amemiya witnessing the scene, is spine-chilling.)