One weekend afternoon, while his parents are away on a trip, Ryo finds himself alone and bored. On his way home, he runs into Rena, his friend's older sister. Rena, having left home after a fight with her husband and unable to return to her parents' house, ends up staying at Ryo's place. Ryo has long admired Rena since childhood, but now that admiration has grown into intense adult desire. Overcome with excitement, he begins to indulge in vivid fantasies. Unaware of his feelings, Rena teases him playfully, her guard completely down. Unable to restrain himself any longer, Ryo waits until she falls asleep, then quietly reaches out and begins touching her large, soft breasts.