Warriors from around the world, known for their legendary fighting abilities and skills, receive mysterious invitations to participate in a martial arts tournament. During the tournament, the organization surrounding it reveals their true identity — The Kingdom — and their purpose to recruit fighters to join their militia or enslave those against them. While several of these warriors made it out in time, many were never heard from again.
Five years later, a government project called "Street Masters" initiates in order to counter-act the war against The Kingdom, now having divided and seized control over the world by several of its factions. Those who join the Street Masters project must work together to take down each faction, crippling parts of The Kingdom before they're able to launch their end game.