Young newlywed Ruka, married at an early age, had no sexual experience with any man other than her husband—and lately, their relationship had grown distant. With her desires unmet, she began fantasizing about sex with other men, relieving herself through masturbation. One day, while delivering newspapers, Yamamoto accidentally caught a glimpse of Ruka changing clothes, instantly becoming aroused. Unable to control his urges, he called over his friends and began plotting to take advantage of her.