A delicate relationship where the heart is family, but the body belongs to someone else— A stepmother who is not wrong and a week spent only with her. (Hayama Sayuri, VENX-328)

Even without blood ties, they can become true family. That's what I used to believe... Sayuri, who married a husband much older than herself. She initially thought that because she and her husband's stepson, Tatsuya, were close in age, they would quickly become close and build a harmonious relationship. However, Tatsuya unexpectedly forces her into a romantic relationship. Confused by this sudden confession, she learns that her husband will be away on a business trip for a week...