Gyakuten Love Smash

Megumi Azuma, a.k.a. Meg, is a third-year junior high school student and she's a naive young girl who even her classmates call her "childish." Meg is attracted to Taku Hinata, a beautiful male tennis player whom she met by chance on the train. In order to make him fall in love with her to become an adult and get back at her classmates, she goes to the "Royal Tennis Club" where Taku plays tennis. Through her interactions with Taku's bad friend, the crass Daisuke Tajima, and others, Meg becomes absorbed in love and tennis.... In addition to the middle part of the title story, this book also includes a short story about the resurrection of a young man who is passionate about skiing.

(Source: Sukima.me, translated)