Ao wa Mijikashi Koiseyo Otome

Midori, who grew up in a girls' school and has no immunity to real-life boys, is second to none when it comes to making her favorite fighting game character win. One day, a high school boy named Eishin, who looks just like her favorite character, tells her "Fall in love with me," and takes her to... the boys' school volleyball club!? Could this be the start of a real-life youth romance...!?

(Source: Kodansha, translated)