Isn't This Martial Arts?

One day you turned on your phone and found that there was a software called "self-service reincarnation" on your phone? ? ? When you clicked with the idea of ​​​​playing. As a result, you were sucked in and entered an unknown world, where even children wearing crotchless pants can learn martial arts... When you are tortured by primary school students until you want to cry, you realize that you can't go back... Only by learning peerless martial arts and killing the mastermind can you regain your life...