Junya and Sanae are still in the early stages of their relationship. Things have been going well, and today marks their first overnight date. Sanae is nervously excited, looking forward to losing her virginity for the first time—until Junya suddenly tells her, "We can't have sex." When she asks why, he refuses to answer, leaving an awkward silence between them as they end up sharing the same bed anyway. Longing just to feel close to him, Sanae reaches toward Junya's waist—only to brush against something unbelievably hard and huge...!?