サイコパス、異世界で蝙蝠に転生す。 (Associated Names)

The man was abused by his parents during his childhood. In February, just before graduating from high school, his only ally, his grandmother, passed away due to illness. The man fell into despair. And he contemplated. “If Granny isn’t around anymore, I guess it doesn’t matter what happens.” The man stabbed his parents. Over and…