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After an accident on his scooter, Yusuke Serizawa awakes to find himself in a hospital bed. The cause of the accident—the sight of a familiar face that distracted him. However, it turns out that the person who distracted him was also the person who called the ambulance for him, and whoever it was won’t reveal their identity. All Yusuke knows is that this person is a woman from his past—someone that he loved and possibly wronged. Now Yusuke must search his memories of the women in his life to discover the identity of his guardian angel. Will Yusuke be able to find the true identity of this woman and rekindle the flame of a past love or will this woman forever remain a mystery, lost to old memories?
The story centers on the relationship between Tsuneo and Josee. Tsuneo is a university student, and Josee is a young girl who has rarely gone out of the house by herself due to her being unable to walk. The two meet when Tsuneo finds Josee's grandmother taking her out for a morning walk.