well true story is that Tachibana Family share a thing in common (Shad, Hibiki's father(Kazu), Hibiki, Simoné and Haruki(Hibiki's grandparents)), they're good persons that deeply cares for their friends and family but.... if you screw up with, they'll become Ruthless killers (Hibiki's when going berserk, Shad's when he gets angry or becomes berserk, Pissed off Kazu)