@LuffyKun Yeah, there was a 1 year time-skip + a few months prior of his own sword training (push-ups, stair-climbs etc.). His drastic growth spurt and abnormal gains was probably due to inheriting the sword's previous owner's powers; think reincarnation.
Hoping the brutality will increase as he works his way up to the ring leader (who looks to be the guy with the girl who has white streaks in her hair).
I like that the handle within the blade is being utilized, and wasn't just for aesthetics.