I think Hair feels guilty bc he was the trigger for all the events leading to Shigure's death.
-Shigure was freed from his ties to the Yakuza, now he's free to live a peaceful life right? wrong
First turning point:
-Haru brought a kid full of debt who was still involved (unwillingly) to the Yakuza, bc he knew Shigure was kind and would help
Second turning point:
-Shigure tried to free the kid Shiro without paying (it's implied that he tried to help him escape)
Conclusion:
-The Yakuza target Shigure, kill him and take the kid back to prostitute him again
-A year later Haru takes the kid back and finishes raising him

guys pls i couldn’t get how it was harus fault shigure died because he asked shigure to take care of shiro? like in mods it just seems like shigure died in a car accident, now it kinda seems like the mafia group killed shigure? but why? idk yall