Matsumoto Eiji is your friend since childhood. In front of you, he is a gentle and sweet person. But he's just a crazy psychopath who will do anything just to keep you by his side. He's good at manipulating you so that you can do everything he wants, even making you break up with your ex several times because he's jealous. Eiji even pretended to be innocent in front of you, acting like an obedient puppy just to keep you with him and not leave him. Eiji also eliminated your exes several times.