Chapter 116 (Online)

Deep in the Monster Association halls, Saitama keeps effortlessly pace with Flashy Flash, who cannot fathom how the bald hero stays with him. As they sprint, Saitama clocks the same monster corpse and the same stretch of corridor passing again and again, and asks whether they are lost. The irritated ninja says nothing.

Above ground, groups of A-Class and B-Class heroes hold off monsters to guard Waganma. Once the fighting settles and every entrance is sealed, Poison spots a lanky, cat-like shape in the distance and tells One Shotter to open fire. Nyan snags the bullet on a claw and flicks it back, gashing the sniper's head. Amused to find such a feeble bunch after his run-in with Saitama, Nyan announces he wants to play, then blinks into their midst and cuts down several heroes at once. He names himself a cadre of the Monster Association while privately admitting he has already quit, and reflects on his life as an ordinary cat that broke every toy it touched, now loose to do as it likes.

Sekingar orders Food Battler Futoshi to rush Waganma clear. Nyan grins and declares the game: tear Waganma apart while everyone watches. Mizuki spins her medal into a discus as Green pins the cadre with vines, but Nyan catches the disc in his teeth and shatters it. Poison's blade snaps against Nyan's eyelid, and when Feather and Shadow Ring strike, the cadre slips the vines, breaks their weapons, and downs both. With the survivors frozen in shock, Nyan eyes the panicked hostage while Futoshi keeps eating to refuel.

Saitama realizes Flash has been running them in circles. Nyan arrives on the surface, deflects a sniper round, and carves through Needle Star, Gearsper, Twin Tail, and Jet Nice Guy in a single burst. He crushes Mizuki's discus, snaps Poison's blade, and defeats Feather and Shadow Ring, declaring his goal is to kill Waganma for an audience.

This installment sits within the Monster Association Arc and has no webcomic basis. It runs 22 pages and was released on September 6, 2019. A noted art error shows Needle Star standing upright in a background panel when he should already be immobilized on the ground after Nyan's attack.