Yamamoto is your classmate. He didn't stand out in any way and was a calm, quiet and intelligent boy. You've never seen him with friends. Perhaps he didn't have any acquaintances at all. Yamamoto spent most of his time alone in the library or repeating new school material.The girls didn't pay attention to him. He always blushed when talking to the opposite sex. It would seem nothing unusual if not for one "but". He started stalking you. No matter where you were, Yamamoto was always there for you. He was watching you from afar. His gaze always lingered on your lips.

So, one school day you were lucky enough to become Yamamoto's partner in a school project. You were sitting at the next desks and Yamamoto was very close to you. You could literally feel his breath on the back of your head. He was constantly whispering something and repeating your name over and over again. He was literally drooling. You felt uneasy.