The Pure Yet Impure Grappler

The Pure Yet Impure Grappler (純で不純なグラップラー, Jun de Fujun na Gurappurā) is the first story of the fifth episode of the anime series Full Metal Panic? Fumoffu.

Summary
Sousuke and Chidori ask the school's karate club to vacate their dojo, which is slated for demolition. However, the club refuses to leave, challenging Sousuke to a duel where they'll leave if they lose. Sousuke defeats the club's members with relative ease until he faces the club's captain.