In a bizarre turn of events, Hana Kayama is confronted by Keito Mikita, a stranger who proposes they live together as a married couple mere seconds after meeting. Hana is understandably wary, until she realizes Keito is the younger brother of an old friend. Despite her lingering doubts, Hana agrees to let Keito stay with her. As they begin their unexpected living arrangement, Hana grapples with her feelings for the man who has grown from the boy she once knew. But can she reconcile those feelings with the 10 years of "true love" he claims to have for her?
