Nisekioku Soushitsu no Hachiyo-san  

Hachiyo of false memory loss, ニセ記憶喪失の蜂夜さん

High school student Marui discovers Hachiyo unconscious near a riverbank. Although Hachiyo was known as the toughest troublemaker at school, Marui secretly harbors feelings for her. But when Hachiyo regains consciousness, she can't recall anything about herself.