"I loved my son as a man." Yusuke's mother, Yui, goes to Tokyo to attend college and takes care of her once a month. However, as she goes to the store many times, her affection for her child eventually changes to her feelings for the opposite sex, and she ends up making a vow that must not be crossed. "There's no way this kind of relationship is allowed. If we don't see each other for a while, we should be able to go back to being the parent and child we were before, and that's good... but is it really okay?" It's even more intense this month...
