Rin has been in a casual, friends-with-benefits relationship with Kaito, who works at the same cafe, because she finds it comfortable. However, she suddenly receives news of a marriage from a female friend with whom she used to have a lot of fun, and she begins to feel anxious about her current situation and wonders if she should seriously look for a boyfriend. She can't bring herself to end her relationship with Kaito, but when Kaito finds out about Rin's feelings, he suddenly reveals his possessiveness...!