When Mizuki Hijiri went to a new school, all she wanted was to live a regular school life, but that was not the case when she encountered the fabled Hero Club. All of its members are boys suffering from various types of chuunibyou—Yamato Noda is a righteous hero who uses his athletic abilities to perform noble deeds and protect others; Kazuhiro Nakamura claims to be the reincarnation of "Touga Ryushouin," the result of the forbidden union between a demon and an angel; Tomoki Takashima is a pretty-boy otaku whose one true love is the Hijiri was dragged along as the newest member of the Hero Club.