Nito no Taidana Isekai Shoukougun ~Saijaku Shoku "Healer" nano ni Saikyou wa Cheat desu ka?~ - Ch. 30.1 - The Day a Country Disappear

[ExecutiveDirector]

Hmmm.... something's not right. Almost feels like he's possessed by something, he didn't show any hint of this kind of sadistic murderous rage during his time with the others. It was like as soon as Dragon's Heart contacted him it flipped a switch in him.

Not really. Dude was bullied for years. He was mid suicide before tThe summoning. He was maimed by the mimic and spent tortuous time in the dungeon. Dude has massive, unprocessed trauma. MC is basically a school shooter we sympathize with. This darkness may have been inside him for years. Only now he’s got power to do something and a world with few consequences.