Moriko Shiratori is an introverted pessimistic girl. After moving for her father’s job she finds it difficult to settle in, newly attending Cognition Facility B-2. Meeting a boy at the facility by the name of Toboso Nobuhiro, she’s met with his irritating and childish antics each day. Consistently tailing her throughout the school and giving her the name 'Ghostie' for her pale complexion, she wonders; Will I ever get rid of him!?