His wife Yuki collapses from heat stroke and is hospitalized as a precaution. Takashi suddenly has to live alone until Yuki is released from the hospital. Then, Takashi's mother-in-law Miya comes to live with him at Yuki's request. And when he meets Miya for the first time in four years... Takashi remembers the events of those four years ago. The one and only mistake he made with his "mother-in-law". However, when he sees Miya cleaning, still as sexy as she was back then, he can't help but get turned on...