Returning home for a local festival, Rin stays the night at her friend Yumi's house. Yumi's son, Yuya, has long cherished secret feelings for Rin. That evening, slightly drunk, Rin visits his room. Carried away by the alcohol, she confesses her true emotions as they share an intimate first experience. Responding passionately to the young man's desire, Rin eagerly gives herself to him. From that moment on, the two begin a secret, deeply emotional affair. As Rin's departure draws near, their bond grows ever stronger.