Due to ongoing renovations at his family home, Junichi ends up staying at his aunt Hibiki's house during his time off. Hibiki is young, beautiful, and deeply affects Junichi's heart. Living under the same roof, Junichi spends each day filled with nervous excitement. However, Hibiki's attitude remains strangely cold, making Junichi suspect there's something she's hiding. Then one day, Hibiki drops a shocking confession: "My husband is cheating on me." Stunned by the truth, Junichi decides to honestly confess his own feelings to her. That single step becomes the turning point that drastically changes their relationship.