Rei, a classmate of Haruka's from her school days, who came to Tokyo for sightseeing, was talking to Haruka with fascination, trying to convey the excitement of seeing a men's strip for the first time in her life that evening. - Then, her son Makoto came home to replace Haruka, who was planning to go on a trip there. - Rei's eyes sparkle at Makoto's young, strong body, trained through sports, and, taking advantage of Haruka's absence, she asks Makoto to dance in the tiny bikini panties she bought as a souvenir. - Makoto reluctantly changes his clothes and starts dancing due to Rei's serious gaze, but Rei's passionate gaze staring at his crotch and this abnormal situation makes him get an erection.