So, Satoru is Haru's older brother and their relationship is the hardest kind!!

Haru and Satoru are two half dragon and half human. Haru has 18 years and Satoru 25.
Satoru always try to bem the bully like big bro, but he really love Haru to the bottom of his heart and always say that he must be strong like the big bro.
Haru is more calm and childish and he doesn't care about "useless fights"... is really hard to these two get along in a normal way.

For you that don't know, Haru in his dragon form has the same colors patterns of Killer Joe, right? Is because Haru is the reicarnation of Kill Joe, that is more calm, more nice and with hopes and dreams.