Sweet Mask vs. Do-S and Narinki's Private Squad

Huhuhu... I'm so happy to meet you. Just between you and me... I'm actually a fan of yours.

Sweet Mask vs. Do-S and Narinki's Private Squad was the battle between the A-Class hero Sweet Mask and the Demon-level mysterious being Do-S along with her love slaves, Narinki's Private Squad.

Prelude
Sweet Mask orders Atomic Samurai's disciples to flee. Do-S asks his reason for doing so; Sweet Mask replies by saying they would only get in the way, and that he didn't want them seeing what he was about to do. Do-S comments on his looks and admits she is a fan of his, proceeding to unhook her mask, revealing a snake-like tongue and asks him to "spend some quality time together". She also offers to release Narinki's Private Squad of her mind control if he agrees to her conditions, but Sweet Mask says that bargaining with him was useless, telling them to prepare for death. Despite this, Do-S is still determined to make him her love slave.

Battle
Do-S orders her love slaves to attack, and the private squad lunges at Sweet Mask. The hero mentally images his attack of slicing the heads of all the love slaves with his hand, but before he can follow through, the three disciples intervene. Iaian slams Noria and Asami into the wall, Bushidrill hits two of the mercenaries into the ceiling, while Okamaitachi knocks out the other three with his Air Blades. This momentary distraction creates an opening for Sweet Mask, who grabs Do-S' whip and slams her head into the wall, disorienting her. Sweet Mask asks why the three disciples came back. Even though Iaian knows the hero planned on killing the mercenaries, he pretends as though Sweet Mask merely sent them away to lower the enemy's guard. The two exchange stony glares, but Bushidrill tells Iaian not to mince words. He demands for Sweet Mask to tell the truth about his intentions to kill the mercenaries. Sweet Mask views his statement as nonsense, and derides the three swordsmen not only for misunderstanding the intentions behind his instructions, but for intervening in the battle, and even though it went well, their actions were still unforgivable, and he would report them to upper management. Okamaitachi gets angered, though Iaian stops him. He decides to act diplomatic for now, but senses something odd in Sweet Mask and is determined to dig up some info on him after the raid. Iaian apologizes to Sweet Mask for the misunderstanding and that they're still heroes-in-training. Sweet Mask mocks them and their master by saying the apples don't fall too far from the tree. In his mind, Sweet Mask views being a hero as vanquishing evil, including evil's accomplices, and by that logic, he thinks that those who lend a helping hand to evil's accomplices are also evil. He briefly considers taking out the three swordsmen, but before things escalate, the mercenaries wake up. Iaian comforts them, and the mercenaries all express their gratitude while crying with relief.

Sweet Mask watches the scene in silence, though his lapse in focus allows Do-S to strike. She wraps her leg around the hero's throat, and pierces his eye with her tongue. She taunts the hero for letting his guard down, but is shocked when she sees that the hero's eye isn't bleeding, and that instead, his eye and face are merely cracked. Do-S realizes that Sweet Mask isn't human, and the hero crushes the monster's head, ending the battle.

Aftermath
The mercenaries ask Sweet Mask if he's alright, and the hero claims he's fine, the damage having already regenerated. The mercenaries instantly recognize Sweet Mask and swarm around him, with Asami asking him to sign her shirt while Noria asks for a photo with her. The A-class hero becomes visibly annoyed and demands the three swordsmen take them back to the surface since he can't leave the battlefield. Iaian tells Sweet Mask to leave them to the swordsmen and says they have a battle plan. With this victory, Sweet Mask continues on his rampage throughout the Monster Association Headquarters, forever freeing any love slaves from Do-S' mind control.

Trivia

 * Do-S replaced Goddess Glasses' role in the webcomic due to being a design from another mangaka back when ONE was still unemployed.

Version 1 description of the battle begins after Atomic Samurai's Disciples flee

Version 1
Sweet Mask orders Atomic Samurai's disciples to flee. Do-S asks his reason for doing so; Sweet Mask replies by saying they would only get in the way, and that he didn't want them seeing what he was about to do. Do-S comments on his looks and admits she is a fan of his, proceeding to unhook her mask, revealing a snake-like tongue and asks him to "spend some quality time together". She also offers to release Narinki's Private Squad of her mind control if he agrees to her conditions, but Sweet Mask says that bargaining with him was useless, telling them to prepare for death. Despite this, Do-S is still determined to make him her love slave.

Do-S orders her love slaves to attack, and the private squad lunges at Sweet Mask. The veins in Sweet Mask's neck bulge, along with the veins in his eyes, and with seemingly minimal effort, he rips apart all of the love slaves, dismembering their limbs, blowing holes through them, and ending their lives. Do-S is shocked by Sweet Mask's lack of hesitation, and wonders if this is truly the same hero she was familiar with. Do-S yells in anger, and swings her whip at Sweet Mask, but to her disbelief, Sweet Mask manages to block and completely resist her mind control.

Seeing as how she is completely outmatched and with no love slaves remaining to assist her, her true cowardice shows, and she falls to her knees and begs for mercy. Sweet Mask stands over her and watches as she surrenders and promises to follow his orders, going so far as to call him "master" and giving him total dominance over her. Sweet Mask grabs her chin, causing her to smile in hopes of being spared, but unfortunately for her, Sweet Mask isn't willing to show her mercy, and tells her to die as he presumably kills her by some unknown means off-screen.