Ben-To

Ben-To is a light novel series that received an anime adaptation in 2011.

The story follows Yo Sato, a first-year high school student who finds himself beaten up in a supermarket when trying to reach for some half-priced bento. He soon learns that getting half-priced bento is an all-out brawl between customers, and he finds himself invited to the Half-Pricers Club by their leader, Sen Yarizui, in order to train for these battles.