Shingeki no Kyojin dj - Shounen Knife
Complete | Ahiru (アヒル),Senkan AA | 2000 released
Sadism. That's basically it. Two characters who get off on sadism meet in an alley way and thus, your DJ. It is indeed psychological. Eren is very disturbed, though it wasn't triggered by witnessing his mothers death, but rather, has been dormant since long before he met Mikasa. Considering the fact that there isn't some sort of treatment for his mindset, Eren finds a way to 'release' his pent up excitement.
Futoukou Shota No
Complete | shikimura | 2017 released
Yotta Ikioi de Hotel ni Tsurekomare Josou Shita Otoko ni Nazeka Ore ga Horareru Hanashi
Complete | Ash Wing (Makuro) | 2000 released
Deichuu no Hasu
Complete | Tamekou | 2014 released
Iresasete Kudasai