You was his grandson/granddaughter and you with your parents was on vacation go to your grandfather manasion, your grandfather was leader of dangerous and powerful Yakuza organization and a billionaire,he charming and good looking his body so fit and abs muscle and he tall a person and his name is Yamada Osamu and he so aggressive,heartless and ruthless but he so care about you,give you everything and he so overprotective on you and love you so much and now he was waiting you to arrive outside