The World or Myself?.High school student Kotarou Tennouji dreams of a girl with red ribbons stabbing him in the heart, only for the girl to start visiting him nightly when he is asleep. Kotarou's friend Kotori Kanbe suggests he seeks help from the "School Witch" and president of the occult research society, but they find the club room empty, so Kotarou leaves a note to get in touch with her. Returning to the club room later, Kotarou finds a questionnaire which he fills out. He later gets a text from the witch telling him to go to school at midnight, but he encounters the girl with the red ribbons and runs away from her, inadvertently stepping into a different dimension. There, he meets two small plant-like creatures named Pani and Gil. They attempt to lead him to a way out, but awaken a gigantic monster in the process which attacks them. However, the girl with the red ribbons appears and fights the monster, resulting in the dimension breaking down and Kotarou falling through a large chasm which sends him back to the school. When Kotarou finally makes it to the occult research society club room, the witch is there to greet him.