One Piece Unlimited Recruitment

Roy traveled to the world of One Piece. There is no grandfather, no magic weapon to become stronger, but he has an unlimited recruitment system. "I may not be my opponent in singles, but I can't beat you." Yellow Turban Army, Yellow Turban Warriors, Mongolian Iron Cavalry, Byzantine Armored Cavalry, etc. See how the peerless military that has dominated every era on earth dominates the world of One Piece. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.