Sigh...seems like the kid was done no matter what, he was bullied to absurd levels, and the guy tha t did it were in gangs or connected to the yakuza from what I can tell.. He snapped and killed 1 more or with the huge knife he had, and decided to have sex with the ghost and possibly freed her by coincidence or will. The ghost finally broke the seal and had wild sex with him...but doesn't seems like she understood a word he said...killed him brutally, and he didn't become a ghost, she feed on his corpse and throw away some parts, doesn't looks like she cares about him much, will probably forget about the head soon... And is unlikely she will finish to take revenge for him, she is simplt free again, dude unleashed a natural disaster level threat. If we at least had some hint of she going for delinquents after it would be something, but I really believe she didn't understand a word he said.