A mysterious boy comes to Saku Fujigaya's rescue when she falls ill on a train, but he leaves before she can thank him. After this experience, Saku never ignores strangers in need of help to emulate the boy who helped her.

Saku has her long-awaited meeting with Ryosuke, only to discover he wasn't the person who helped her. Learning that her feelings for him were based on a misunderstanding comes as a shock. Saku finds herself drawn to Haruki, who has been supporting her all along, but how can she take the next step when she isn't even sure what love is anymore?