Serina Shinjo

Serina Shinjo is a schoolgirl with an attractive body and a selfish personality. Masato's parents hire some private tutors to improve his poor grades, but it turns out that they are the Shinjo sisters, who have been bullying Masato for a long time. During their private lessons, the Shinjo sisters use Masato as an outlet to release their stress, which weakens him mentally and physically. Masato used the hypnosis device to manipulate Serina to his whim and makes her absolutely obedient as a sexual release for his previous grudges.