Yuki's husband is assigned to work alone and lives with her only daughter, Kana. One morning, when Kana heard the words, "Today ... can I bring my boyfriend?", Yuki was enthusiastic about cleaning while looking forward to what kind of <Kareshi> would come to his house. Then, in the afternoon, Kana returns home with Norihiko Kaleshi. Men and women around the age ... A closed room for only two people. Yuki didn't know that such a tragedy awaited in a few minutes. That tragedy that returns Yuki from <mother> to <woman> ...