One day, Meguru, a high school girl, suddenly regains her memories of her previous life when she was a little bird. Her owner in her previous life, “Ao-kun” (Ao), who is somewhere in this town, has a bad luck constitution. In the world between her previous life and this one, Meguru is told that Ao will never be happy as he is, so she decides to make him happy even if he is reborn. After regaining her memory, Meguru immediately seeks out Ao and guides him to happiness while working part-time at the bookstore where he works!