Due to his wife's training, Yuuma is being looked after by her mother, Mio, for two days. On the surface, he seems unwilling, but deep down he is very happy, as he thinks of Mio, who is always kind, as if she were his real mother. Although he tries to enjoy their life together, which began due to an unexpected turn of events, Yuuma is exposed to the sex appeal that Mio exudes. Mio's body, as she sleeps, is sweaty and is enough to arouse his desire. Driven by his sexual desire, which can no longer be controlled...