Infinite 100%

Above the Nighteye fight, Rikiya Katsukame shrugs off police restraints, powered by the same enhancer Irinaka used, and drains the stamina out of Ryukyu's team. Ochaco Uraraka and Tsuyu Asui drop where they stand. Ryukyu and Nejire Hado keep swinging until the drug fades, and a Deku who is not really Deku appears to point out exactly where the enemy is. Uravity floats the giant, Ryukyu hauls him skyward, Froppy steers, and the exhausted girls dig for one more push. Nejire blasts the whole group through the floor. The Izuku they followed was Toga wearing his face, part of a scheme that also had Twice's copy of Mr. Compress tunnel the two of them up to street level with orders to grab Eri for themselves.

Below, the arriving heroes barely register the League because Sir Nighteye is dying. Deku goes after Chisaki, who raises himself and Eri toward the surface on a column of stone. Watching Lemillion's cape tumble through the air, Eri understands that none of these people intend to quit, whatever it costs them, and she reaches for the fabric with a resolve of her own. Her horn blazes gold. An old memory fills in the rest: the boss once asked Chisaki to study the child whose power had erased her father and driven her mother away, believing the two of them alike, and Chisaki instead discovered a Quirk that rewinds.

Eri unwinds Chisaki back to the man he was before the fusion, then leaps for Deku, who catches her and swears he is not letting go again. His counterattack goes wrong in a spectacular way, a shockwave that demolishes the pillars and throws them both into the sky at a full 100 percent, and yet nothing in him breaks. Chisaki repairs himself, absorbs Katsukame, and grows worse. Landing, Izuku works out that Eri's power has been undoing his injuries before he could feel them, and reasons that if he damages himself faster than she can rewind, he will not be erased, which leaves him free to hold 100 percent indefinitely.

Chisaki demands the girl back, claiming that he alone understands what she is worth, that her Quirk was always meant to become the bullets that would unmake hero society and drag the world back to its natural order. Deku answers that her power is a kind one and kicks the monster into the air. Flashes of the old boss's refusals run through Chisaki's head, a man he wanted to repay and who blocked him at every turn, until he settled on forcing the old man to rest. Deku asks what kind of hero cannot save one girl standing in front of him, gives the villain no gap to heal, and finishes him with a smash at full power. Reaching the surface, Nighteye finds the future he foresaw simply gone.

Ryukyu's squad defeats Rikiya Katsukame after Nejire drops the entire group into the underground labyrinth.

Himiko Toga's impersonation of Deku is revealed, and she and Twice send a Mr. Compress double to seize Eri on their own.

Eri awakens Rewind deliberately for the first time, reverting Chisaki out of his fused form.

Izuku uses 100 percent Full Cowl without injury and realizes Eri's power lets him sustain it, unlocking his own indefinite full output.

Deku defeats Kai Chisaki, and Sir Nighteye witnesses the foreseen future collapse.

The episode covers Chapters 156 through 158 plus the opening pages of Chapter 159, closing out the raid's central confrontation.

Cut from the adaptation are a young Chisaki musing on where Quirks came from, the civilians sheltering as their homes collapse, and the narration covering Eri's failed escapes, her surrender, her reactions to being dismembered, and her belief that her birth was the problem.

Eri's leap is staged differently. The manga has her already falling toward Deku when she decides she wants saving, while the anime lands her on the pillar's edge first and lets her jump. The adaptation also adds an aftermath beat for the 100 percent shockwave, with Chisaki knocked flat, debris raining near Katsukame, and Ryukyu shielding Uravity, Froppy, and Sir Nighteye.