The Pure Yet Impure Grappler
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Kaname and Sousuke get a special assignment to evict the Karate Club from their old clubhouse, but in order to do that, Sousuke makes a special contract challenge putting Kaname's livelihood on the line! Sousuke must defeat the Karate guys but violates the code of ethics by using weapons, so without that advantage, how will Sousuke succeed?
V10: Dounimo Naranai Gori Muchuu, from the short story Jun de Fujun na Grappler.