Heroes vs. Monster Association Executives

From here on out it's a free-for-all. Most amount of S-Class kills gets to lead, how 'bout that?

Heroes vs. Monster Association Executives is the battle between the heroes Zombieman, Sweet Mask, Child Emperor, Atomic Samurai, Iaian, Pig God, Tanktop Master, Sosshi, and Tatsumaki against the Monster Association Executives, Homeless Emperor, Black Sperm, Fuhrer Ugly, Evil Natural Water, and Gums.

Prelude
While Tatsumaki confronts Psykos and Orochi, the other Monster Association executives are locked in their one-sided battles with the heroes. Tatsumaki interrupts each encounter by shielding the heroes with energy barriers and bringing them to the surface, leaving the executives behind. The heroes help Tatsumaki defeat Psykos and Orochi, with the Monster Association base being destroyed in the process.

Presuming their foes all destroyed, the heroes anticipate victory. However, all of the executives are revealed to have survived, and reach the surface immediately after the last battle concludes, taking the heroes by surprise.

Battle
Homeless Emperor arrives on the surface and immediately unleashes a barrage of orbs against Zombieman, taunting the hero's claims about humanity. He derides Orochi and Gyoro Gyoro for their defeat, giving Sweet Mask an opportunity to attack, only for Black Sperm to burst out of the ground and grab the hero mid-air. Fuhrer Ugly arrives immediately afterward and unleashes a Face Crushing Punch on Sweet Mask, before splitting him in two and tossing him away. The three executives agree to compete with each other for the title of Monster King, with the goal being the most S-Class kills. Child Emperor tries to drag Zombieman to safety and alert the other heroes, but is spotted by the monsters.

Fuhrer Ugly steps on Zombieman's regenerating body and taunts Child Emperor while readying a punch, but is interrupted by a massive orb launched by Homeless Emperor. The orb impacts the ground in a massive explosion, with Atomic Samurai, Iaian, Pig God, and Tanktop Master, as well as Fuhrer Ugly, only nearly avoiding it. Atomic Samurai tries to contact Child Emperor, who seemed to have been caught in midst of the explosion, but gets no response, just as Evil Natural Water emerges from the ground. Iaian immediately recognizes the threat and readies his sword in fear. Pig God and Tanktop Master are similarly barely able to avoid being eaten by Gums, who bursts forth from the rubble.

Homeless Emperor, Fuhrer Ugly, and Black Sperm quarrel with one another, but agree to work together as they head out to confront the rest of the now disoriented and split up heroes.