Sumire Kuramoto, who got married last year, had imagined a happy married life, but it seems she is actually spending a very mundane everyday life. The biggest reason for this is her husband's indifferent attitude; even when they eat together, there is almost no conversation, she spends her weekends immersed in her hobbies alone, and the occasional nighttime activities are said to be sex that is completely devoid of affection, only to satisfy her sexual desire. Her dissatisfaction with such a husband reached the limit of her patience, and as a way to resolve it, she developed a desire to cheat.