The high school girl Yura once had a peaceful life; that was changed after she saw a girl named Urushi attempting suicide on a bridge. Looking at Urushi's witch-style dressing and vocabulary, Yura realized that Urushi was a "Chuunibyo."

女子高生・由羅の学生生活は平凡で穏やかなものだった。橋の上に佇む少女を目撃するまでは――。少女の見た目としゃべり方、これは「中二病」というやつか…？