
The eighty-ninth Vigilantes chapter turns the Underground Masquerade fight pit into a disaster zone. Rumi Usagiyama runs riot over the arena, gas floods the cage and drives every Quirk inside it haywire, and a black mist starts harvesting powers from the helpless. Iwao Oguro drops his cover to organize an escape.
The announcer keeps up his frantic play-by-play while Rumi Usagiyama flattens the arena wholesale, dropping fighters, spectators and staff with kick after kick. Being badly outnumbered barely slows her. Iwao Oguro and Kendo Rappa reach the floor to find the chaos in full swing. Rappa passes on joining, since a free-for-all is no proper death match, and Iwao decides the confusion makes decent cover for slipping out of the building, with Rappa trailing him and still nagging about their rematch.
An alarm cuts in and gas begins flooding the cage. Anyone who breathes it loses control of their Quirk entirely. Iwao spots the venue staff pulling on masks, which tells him the whole thing was arranged in advance. The three of them stay clear, the two men tucked behind a corner and Rumi perched above the cage. Then black mist gathers in front of each victim, a hand reaches out of it, and their Quirks are pulled away. When the mist turns toward Rumi, Iwao triggers Overclock and snatches her out of its path. It gives chase, and he works out that it tracks by sight, so he uses the panicking crowd to slide into its blind spot.
Iwao then admits his real identity. He is O'Clock, the high speed hero, and he invokes a hero's right to request help from civilians during a crisis. He recognizes Rumi's school uniform and offers to smooth things over with her teachers, an offer she waves off before asking what she can do. While Rappa and Rumi argue over whether punching or kicking matters more in a fight, Iwao lays out the objective: break out of the underground structure and regroup with the police waiting above. The two grumble at being ignored, but hold their ground once he questions their nerve.
Elsewhere, the two mysterious voices watching the venue identify O'Clock and rate Overclock far too valuable to let walk away. They decide to spend their finest resource, and a hooded figure steps out of the drifting gas.
A black mist begins stripping Quirks from the arena's dosed attendees one by one.
Iwao reveals his O'Clock identity to Kendo Rappa and Rumi Usagiyama and enlists them both for the escape.
The two voices overseeing the event send a hooded figure after Iwao, intending to claim Overclock for themselves.

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Hideyuki Furuhashi wrote and Betten Court illustrated this installment of My Hero Academia: Vigilantes. It ran on November 14, 2020, spans 17 pages, sits in the Underground Masquerade arc, and was collected into Volume 11.
Rumi Usagiyama fronts the cover as Tiger Bunny, and the Hooded Man makes his first appearance here.
Serialization carried the shorter title Tiger Bunny (タイガーバニー, Taigābanī), which was revised for the volume edition.
Chapter 89 (Vigilantes) has Rumi Usagiyama tearing through the Underground Masquerade arena while a mysterious black mist begins stripping Quirks from gassed attendees, forcing Iwao Oguro to reveal his hero identity and organize an escape.
In Chapter 89 (Vigilantes), Iwao Oguro reveals himself as O'Clock, the high speed hero, invoking his authority to request help from Rumi Usagiyama and Kendo Rappa during the crisis.
According to Chapter 89 (Vigilantes), an alarm floods the fighting cage with gas that makes anyone who breathes it lose control of their Quirk entirely, and Iwao Oguro notices the venue staff already wearing masks, proving the attack was planned in advance.
In this chapter, a black mist gathers in front of gassed victims and a hand reaches out of it to pull their Quirks away one by one, a threat Iwao Oguro barely saves Rumi Usagiyama from using his Overclock Quirk.
Chapter 89 of My Hero Academia: Vigilantes, released November 14, 2020 in Volume 11's Underground Masquerade arc, introduces the Hooded Man, who is sent after Iwao Oguro to claim his Overclock Quirk.
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