'Yuri' is a solitary boy who has never held a girl's hands before. Upon entering highschool, he began to date a girl named 'Lizzie' - however, it is revealed that she is actually the daughter of a family of assassins! To make matters worse, Lizzie's father-in-law (a cute girl) appears and attempts to take Lizzie back. Consequently, Yuri's daily life becomes a mess!