Sena Uchiyama, one of the Uchiyama twins alongside her sister Rena, falls prey to a predatory taxi driver's calculated pattern. The driver repeatedly picks up both sisters in his taxi, deliberately obscuring his identity across encounters to avoid recognition. Through these orchestrated rides, he gathers compromising information to establish leverage over them. He ultimately deploys this material to blackmail the twins. Following the blackmail, Sena endures non-consensual acts by the driver and is subsequently imprisoned as part of his "collection" of women. This abduction and confinement mirror his established methods with other victims, including Satsuki Shiina.