This is a secret memory she will never forget. At a small celebration at home for her husband's promotion, his old classmate Makoto suddenly confesses his feelings while they are alone. Torn between guilt and a newly awakened attraction, Rino wavers. Makoto's passion only intensifies; after he steals a kiss, her words still reject him, but her body can no longer suppress its burning desire. Their betrayal leads to unprotected sex and creampies that may leave her carrying her husband's best friend's child.