Kanon, who had been ostracized as the sister of a “murderer”, starts working as a housecleaner and meets Junya. She finds herself attracted to him who has a gentle and soothing smile. However, Junya has a bed-ridden fiancee, Kiyoka.
One day, Kiyoka miraculously comes out of her coma, and Junya unfortunately finds out that Kiyoka loves someone else. At the same time, he realizes how much Kanon means to him and tells her that he wants to marry her.
On Junya and Kanon’s wedding day, Kiyoka appears unexpectedly. Trying to save her, Junya hits his head hard and loses his memory. Kanon devotedly takes care of Junya who lost his smile; however, the first thing he remembers is the time he spent with Kiyoka…
This is a full-fledged romance story which depicts the lives of youths who love someone with all their heart as they battle “loneliness”.