To keep a girl as precious as a jewel.

One day, Nayu, who quit her job due to social phobia, meets Karen, who is as beautiful as a jewel. Karen has a high fever and is curled up outside. Unable to bear the sight, Nayu takes Karen into her house, bathes her, and takes care of her. However, Karen is homeless and moves from one friend's house to another, and by chance, they end up living together. Sensitive Nayu and free-spirited Karen. Nayu's closed heart gradually opens up as she sees the contrasting lives of the two, and she begins to have special feelings for them. However, it seems that Karen is hiding a secret from her past.