Yuki lives with her only daughter, Kana, because her husband is away from home. One morning, when Kana asked, "Can I bring my boyfriend today?" In the afternoon, Kana comes home with her boyfriend Norihiko. A man and a woman around the age ... A closed room with only two people. Yuki had no idea that such a tragedy awaited her in a few minutes. She causes the tragedy that turns Yuki from
