thought he was about to die, a pink-haired nurse named Yuu Yagami, helped him. He was sent into an emergency ward, and he met a beautiful woman, Reika Mikage. She is a director of the hospital, and she asked him to become a test subject. Because he didn't have any relatives, he accepted it. Then, Yuu was supposed to take care of him. Since that day, his fate had changed a lot. Yakin Byōto Zero: This is the back story of how the genius doctor Ryuuji Hirasaka acquired his perverted pastime as a med school student. He and Narumi Jinguuji are rivals at the top of their class. One day, Narumi tells him that if he can seduce the woman she designates in the 2 weeks before graduation, she'll admit her defeat and do anything he tells her. The girls she suggests are just as beautiful and desirable as herself. Sensing his perverted perceptions transforming into a talent at her tantalizing suggestion, he readily agrees. Characters : Ryuji Hirasaka is the aforementioned villain protagonist of the series. A knowledgeable practitioner, his life takes a sharp turn when he is invited to direct and corrupt a team of nurses at his new place of work. An unconvicted sex offender, Ryuji is vicious, controlling and intimidating, often cold reading those under him to learn about their vulnerabilities and how to exploit them. He sports a mullet and is bespectacled. He is murdered by Ren at the end of episode 5. In Night Shift Nurses Kranke he has a better ending: he marries Ren and the couple decide to move to the countryside to continue their experiments. : Narumi Jinguji is the thirty-two-year-old head practitioner of the St. Juliana Hospital, specializing in gynaecology. Voluptuous and enticing, she arranges to meet with Ryuji one afternoon to offer him the chance to sexually discipline a select group of her nursing staff for the purpose of developing a prostitution ring. As a previous rape victim of her own employee, Narumi exhibits bursts of psychological imbalance and unrest. She is noted for her long green hair. Like Ryuji, she too wears glasses. She commits suicide after attempting to kill Ryuji near the end of episode 5. In Night Shift Nurses Kranke, she is shown attending Ryuji and Ren's wedding. : Bright and friendly, Ren Nanase is a twenty-two-year-old nurse at the St. Juliana Hospital who is arguably