The incidence causes him to be anti social, and all of a sudden his grades are high nd lives his life by choosing to be a loner because he's out for revenge and doesn't want any ties or connection because he doesn't want to lose anyone again cause of the pain he fears to go through again. And so finishing his tenth grade at 17 he sets out to find the yakuza that killed his family, and develops a psychotic personality when he captures his victims, and when he captures his victims he injects them with a paralysis substance that also cause them to not be able to speak or scream, and so he tortures them and leaves a message on their dead bodies to the yakuza boss