Ayaha, a beautiful mother, lives with her son. She feels lonely because she has not been able to see her husband, who is away on an extended overseas assignment. One day, her son's best friend, Yuichi, comes over to observe the stars. Yuichi has had a crush on Ayaha since they were children, and he suddenly kisses her. Against her will, Ayaha feels an uncontrollable fluttering in her heart. Yuichi continues to press himself on her, and when he steals her kiss once again, the unfaithful desires that she had been suppressing are ignited...