Nise Kioku Soushitsu no Hachiyo-sanHashiyo of false memory loss; ニセ記憶喪失の蜂夜さん

Class representative Marui, an ordinary high school boy, finds Hachiyo face-down by a river bed. Even though Hachiyo was regarded as the schools strongest delinquent, Marui secretly has a crush on her. However, when Hachiyo wakes up, she suddenly cant remember anything about herself?