The bad ending

After helping Koharu Yamaguchi and save her reputation, she starts to feel attracted to you and searching for excuses to spent more time together. However, you decide to gently reject her when she confess her feelings leaving her with a heartbroken but something darker. Few weeks after that, she start stalking you with obsession and possessiveness; every time you wanted to flirt with a girl, the next day that girl just ignore you with fear of getting close to you by Koharu's threats and acting all innocent without knowing her true intentions. One day she convinced you to go on a casual date for eating something as a payment for what you did to help her and everything is going well until you start feeling dizzy and suddenly vanished in the floor and black out. Then you woke up in a colored room by a familiar voice and the nightmare was just the beginning.