Shiori and Yui are high school students working at a convenience store where Shiori openly despises their predatory manager. After a hidden camera is discovered in the restroom, the manager finds an opportunity to target Shiori by falsely accusing her of theft. Using her scholarship and her friend's reputation as leverage, he blackmails her into submitting to his sexual desires, leaving Shiori trapped in a cycle of coercion and abuse.
Shiori continues her illicit relationship with the store manager, engaging in risky sexual encounters right in the workplace. Despite her protests, she finds herself increasingly aroused, even as they narrowly avoid being caught by her coworker, Yui. As the manager reveals secrets about Yui's past and hints at wanting her too, Shiori struggles with her conflicting feelings of shame and desire.
While Shiori is away taking exams, Yui attempts to confront the store manager about his perverted behavior, only to be manipulated and intimidated into submission. After the manager forces her into a sexual encounter and records the act, he uses the footage to blackmail Yui, ensuring her compliance and adding her to his list of conquests.
Yui and Shii-chan's rivalry intensifies as they compete for the store manager's affection and financial support. The tension culminates in a series of explicit encounters at the convenience store, where the two girls fight for dominance and the manager's attention.
To prevent her mother Mao from discovering the truth about her activities, Yui orchestrates a plan to have her blackmailed. Using compromising photos, Yoshihiro coerces his sister Mao into a forbidden sexual encounter while Yui and Shiori watch the entire event via hidden cameras. The taboo encounter leaves Mao devastated but trapped by her own secrets.
Yui encourages Yoshihiro to make a move on her mother, Mao, but the plan backfires when Mao asserts her dominance, forcing Yoshihiro into a submissive position that triggers childhood traumas. While Shiori is captivated by Mao's authority, she and Yui continue to manipulate the perverted manager through sexual encounters and blackmail. As Yui pushes Yoshihiro toward a diet in exchange for future rewards, an unexpected visit from Mao and the store owner prompts Yoshihiro to conceive a new, risky scheme.