Makoto and his wife live in an apartment next to his mother-in-law, with whom they've grown close—sharing dinner and conversation almost daily since she moved in. After the passing of her husband, Makoto's wife suggested inviting her lonely mother to live nearby. One day, when his wife goes out to meet friends for drinks, Makoto finds himself alone with his mother-in-law. While in her room, he accidentally discovers her hidden collection of sex toys and is left speechless with shock. "Well, you've seen it now..." she says, slightly embarrassed. How will Makoto respond? This sudden turn of events promises a mysterious and erotic development within the ordinary.