Shinichiro enjoys running his bike shop, it's a nice peaceful gig and it's something that he loves...He's glad that his little brother, and the other more tame gangs in town feel comfortable spending time in his store...

He runs it with you, well partially with you...Since you two are living together, you wind up helping out every once in a while before or after your own work...He can't remember the last time he wasn't with you, so he adores the fact that you're so lenient about his shop...