Kinta-kun ni Goyoujin!

Haruna, a strong-willed and bossy girl, once threw Kinta, a boy two years her senior, to the ground in an elementary school "Kintaro" play. When Haruna becomes a junior high school student, she notices a strong and cool upperclassman who turns out to be... that Kinta?! (Source: BookLive, translated via DeepL)