Emi, the close friend of his mother, comes to stay at Tatsuya's place, escaping her emotionally dead marriage. Under the pretense of discussing divorce, she begins living with him temporarily. For Tatsuya, who has never been close to a woman before, just having a beautiful woman under the same roof makes his heart race. Curious, he peeks into Emi's room one night and sees her pleasuring herself, moaning lewdly. The sight ignites his repressed desire, awakening feelings he's never experienced before.