Anna Koshiro has been friends with two handsome guys, Sou and Hinata, since she was young. Despite her crush on an upperclassman named Enamoto, Anna struggles to find a boyfriend due to the speculation surrounding her, Sou, and Hinata's relationship. One day, while visiting Sou's house, Anna discovers that he has a girlfriend. Though not envious, Anna senses that their friendship has changed. Sou's girlfriend becomes upset and forbids Anna from entering his room again, but Sou defends Anna and their friendship, leading to the end of his relationship. Despite her reservations, Anna confesses her feelings to Enamoto. He accepts but becomes unhappy when he learns of her closeness with Sou. On their first date, Anna shares an emotional story about how Sou and Hinata helped her after the death of her pet. Enamoto then asks Anna which friend she prefers, and she confesses her love for him. However, things take a turn when Enamoto attempts to kiss her, and Anna becomes afraid. Anna realizes their relationship is unsustainable, and she can never be romantically involved with Sou or Hinata. But what happens when Sou professes his love for her and asks her out?