When Yoichi, a student in college, rescues a stranded swan on a bridge, little does he know that this act of kindness will result in a surprising turn of events. Later that same night, he is visited by an incredibly gorgeous woman named Miwa, who claims to be the same swan he saved earlier. Miwa is deeply grateful to Yoichi for his help and decides to stay with him to show her gratitude. However, Yoichi is unsure about whether Miwa is really a swan. Will their doubts keep them from exploring a romantic relationship?
