Description：Mitsuko Yamada (played by Yukino Kishii) is a 28-year-old white-collar worker. At a friend's wedding, she was at a loss when she met a man named Mamoru (played by Ryo Narita). The gentle and humorous Mamoru cleverly resolved Mitsuko's embarrassment and discomfort, and immediately captured Mitsuko's heart. After that, Mamoru often asked Mitsuko out for dinner and play. One day, Mitsuko stayed at Mamoru's house, and the two had a relationship. Mitsuko began to live in Mamoru's house more and more frequently. Although there was no confession, the relationship between the two was like a relationship. Gradually, Mitsuko began to regard herself as Mamoru's girlfriend. However, for Mamoru, Mitsuko was just a pastime that could be summoned and dismissed at will. For Mamoru, Mitsuko even quit her job, wanting to marry Mamoru and become a housewife with all her heart. Just when Mitsuko was about to leave, she was so angry that she thought of Mamoru's girlfriend as a man who was not ashamed to be with her.