Masamune-kun no Revenge (2017)

Overview

Masamune Makabe was mercilessly teased for being overweight as child, especially by a girl named Aki Adagaki. Masamune decides to get his sweet revenge by transforming himself into an attractive, intelligent, and athletic young man. After many years honing his new persona, he transfers to Aki's school in hopes of finally getting his long-awaited vengeance.