Masamune-kun no Revenge: Season 1, Episode 1

1 - 1: The Boy Who Was Called Pig's Foot

Makabe Masamune was a chubby little kid but after years of training, he manages to lose weight and becomes a hot guy. This was all so he could get revenge on a girl who called him Pig's Foot as a child by making her fall in love with him and dumping her in return.