Teenager Hikari Tsutsui is an unpopular otaku, with his only friend being the oddball and likewise otaku Yüto Itö. As punishment for being late, Hikari has to clean the school pool and meets Iroha Igarashi, a girl famous for her lousy behavior and lack of friends. Although he is determined to avoid Iroha, he cannot help but take notice of her, especially after she stands up for him against his classmates who mock him...