Yankee Oniisan wo Munekyun saseru Houhou

Hajime, a straight-laced high school student, fell in love at first sight with Mitsuru, a yankee who helped him one day. Since Hajime has no experience in love, he starts approaching Mitsuru while studying shoujo manga. And when he starts to pay attention to his appearance in order to become the man Mitsuru likes, Hajime suddenly starts to get popular...?!

(Source: Kadokawa, translated)

Included one-shot: Senpai no Inu ni Nattara