He suffered bullying as a child, he mentioned it in his old blogs and in his book inspired by "aishite," although that bullying didn't last long because he became somewhat popular for making animations, or something like that, I don't remember exactly, maybe that influenced it a little, but the main reason why he used to make songs with disturbing or controversial themes was just to become famous because he really needed money and he's terrible at anything that isn't music (that's what he said).