Tatsuya, who needs money to pay for his friend's camera, asks his stepmother, who used to be a race queen, if she would like to do a photo shoot. It's been a Riko since Riko last wore a race queen costume, but the cameramen, who are no longer satisfied with simple cosplay photos, escalate their demands... Meanwhile, Riko, who was initially embarrassed about being photographed in a lewd pose, gradually awakens to the pleasure of being photographed and becomes excited...