Kodaka Hasegawa is a second-year transferee to a Catholic school, St. Chronica Academy, and as always, he finds it nigh-impossible to make friends due to his natural blonde hair (inherited from his late English mother) which makes him pass for a Delinquent. One day, he runs into the equally solitary and very abrasive Yozora Mikazuki while she speaks to her Imaginary Friend, "Tomo-chan". They decide that the best way to improve their social situation is to found a club -- Neighbors Club -- to help them make friends and learn social skills.