Hasegawa Kodaka has transferred schools, and he's having a hard time making friends. It doesn't help that his blond hair tends to make people think he's a delinquent. One day, he runs into his bad-tempered, solitary classmate Yozora, while she's talking animatedly to her imaginary friend Tomo. Realizing that neither of them has any actual friends, they decide that the best way to alter this situation is to form a club and start recruiting.