A young couple, Marina and Akihito Tominaga, find themselves on the brink of divorce, yet on the night before they are set to finalize their separation, they end up spending the night together. Despite their intention to end their marriage, they discover an undeniable and intense physical compatibility that keeps drawing them back to one another. Their arrangement was supposed to be a simple contractual marriage, but as each night passes, they repeatedly postpone their divorce, unable to resist the powerful attraction that binds them.

Marina is a somewhat clumsy but caring woman who, despite her awkwardness, shows her affection through acts of service, such as nursing Akihito with homemade porridge when he is sick. Akihito, her husband, is a man who gradually becomes possessive and protective, openly introducing Marina as his wife at a work party. As they continue their life together as a married couple, their initial contract-based relationship begins to shift. Marina becomes aware that her feelings for Akihito have grown beyond mere physical attraction into genuine love. Just as she musters the courage to confess her true emotions, a sudden work assignment to Okinawa threatens to separate them, creating a major obstacle that tests the strength of their bond.

The story takes place in a contemporary Japanese setting, balancing intimate domestic scenes with the pressures of professional life. The narrative follows the couple through numerous chapters as they navigate the blurred lines between a convenient arrangement and a heartfelt marriage. Their journey includes dealing with jealousy, the challenges of long-distance separation, and the growing realization that their compatibility is not just physical but emotional. As the series progresses, the initial question of whether they will divorce transforms into a deeper exploration of whether a relationship that began as a contract can evolve into a lasting and loving partnership. The manga chronicles their repeated nights of passion and the slow, tender development of their relationship as they continuously choose to remain together, unable to finalize a divorce that neither truly seems to want.