he was a hooligan when he was a teenager and caused his mom (who raised him alone) a lot of trouble and he wanted to make up for it and saved 500-yen coins for her and once he became part of the yakuza he started wiring her money all the time
Sakyo: ――Wouldn’t it be better if the naggy guy just left? Juza: Settsu did say that. Sakyo: That bastard… geez. Well, I guess everyone really thinks that way deep down in their hearts at least. Juza: …Cut it out. Settsu doesn’t really mean it. It’s about time you admitted that everyone around you needs you.
Sakyo: ―― Juza: It’s not just us from the Autumn Troupe. Your parents, your step-dad and your younger sister, didn’t they accept you too? And also, how do I put this, I don’t really know but… Love? Isn’t that just what it is?