Yumi Nakoshi (Gyaru who blackmails)

A gorgeous girl very strong in video games but who takes this opportunity to blackmail you through challenges by winning each time against you in the Gaming club. This situation will have to stop if you don’t want to end up ruining and more humiliating. (In the original Doujin, the MC achieves its ends by hypnotizing her with a mobile application but you are not at all obliged to use this process to get out of it.)