The murderer is Pekoyama, the hit was called by the super high school lever yakuza Kuzuryuu. Because you know, they kind of don't do their own hits. Also, I don't think he would be beyond putting him self up as bait to get revenge on EVERYONE that killed his sister even if he died in the process. So Peko is going to get executed, and the motive for chapter three will be set in stone... Except... I don't think chapter three is going to play out like that...

... I am being completely serious here.

Because reasons.