Maomi Mizusawa married Hisae Yabe's son Mao, the sole heir to the Yabe family fortune, despite strongly opposing the union. However, Mao paid no heed to her objections and adamantly refused to call off the wedding. As a result, Hisae insisted on cohabitation as a condition for marriage, which Mao readily accepted. Thus began their shared household, but as time passed, Mao's true nature gradually came to light. As Hisae confronts the reality of his character, a gripping story unfolds, drawing readers into the inevitable climax that awaits.