Ardour. Sachie Wakamura has just lost her mother, and her alienated grandfather has shown up to look after her. The only problem is that Grandpa is a Yakuza gang leader! Too afraid of meeting her new family, Sachie is trying to carry on living her usual life. Since one of the most famous guys in school is part of the gang of her grandfather and her new protector, she can not run far away though.