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?
Through his job at a brewing company, Serizawa gets involved with his boss’s daughter, “the princess”, and her talented friend, a musician named Nana. The surly Nana slowly warms up to Serizawa, and their relationship takes a surprising turn when he finds her walking without an umbrella one night. With these girls joining the list of women who have shaped Serizawa’s life, will he finally be able to discover the identity of the person from his past who saved him? And could this realization lead to regret, or a reunion…?