Osaka Incident Arc

The fifth story arc of My Hero Academia: Vigilantes covers chapters 29 through 35 and episodes 13 through 15, sitting between the Vs. Queen Bee Arc and the Team Ups Arc.

Its through-line is the Villain Factory's escalation. Trigger is no longer producing rampaging amateurs who revert once knocked out; someone is altering bodies to survive lethal doses, and the resulting Next-Level Villains are becoming a problem too big for a hoodie and a pair of skates.

On patrol after Knuckleduster's disappearance, Koichi Haimawari is chased down the street by a mantis-shaped villain he cannot handle. Captain Celebrity dispatches the creature without effort, then lectures Koichi at the penthouse about the workload he creates by picking fights above his level. Kazuho Haneyama concedes the American hero has a point, and talks Koichi out of carrying a weapon, arguing that their job is calling for real heroes rather than beating villains themselves.

At the Narufest the next day, Shota Aizawa, Nemuri Kayama, and Naomasa Tsukauchi compare notes: Teruo Unagisawa's body changed permanently between his two arrests, and other captured villains carry Trigger concentrations far past a lethal dose. Someone is engineering people to withstand the drug. Backstage, Kazuho drafts Koichi as the festival's surprise guest after Captain Celebrity cancels. Meanwhile a disguised figure remotely opens a speeding truck to release the Bat Villain onto Tensei Ida's commercial shoot. The Bat slashes Ingenium, hunts down the vigilantes, and snatches Koichi off the stage before Captain Celebrity knocks it out of the sky. Naomasa asks Shota for help working the streets, and Nemuri talks him into it.

Kazuho travels to Osaka for a regional idol collaboration, with Koichi missing the train and clinging to its side, discovering that his repulsion can work like suction cups. They meet Fat Gum in the city, then Monika Kaniyashiki, an idol working the Kanidoge chain who is really an undercover officer coordinating with Fat Gum and Naomasa. Back in Naruhata, Shota corners the Hotta Brothers and trades leniency for what they know about the tainted Trigger flooding the market and about the crab route.

Monika's absence leaves Kazuho piloting a Kanidoge mech at the show. At the loading dock, Monika finds the drug hidden inside icepacks, and the worker she confronts strips her gun and tablet in an eyeblink, then sets every mech loose, including Kazuho's. Fat Gum holds a rampaging machine while Monika's Snip Clip frees the trapped workers, and the damaged mechs detonate against the Trigger shipment, erasing the evidence. Outside, Naomasa grazes the speedster's leg and deduces his Quirk needs a cooldown, but the villain disarms the entire squad and puts them down with their own rubber rounds before escaping.

Koichi reaches Kazuho's runaway mech using Wall Cling, and Monika, launched by Fat Gum, severs its legs with her Rocket Crab Clip. She pulls Kazuho clear as the machine begins its self-destruct sequence, and Fat Gum absorbs the blast, burning away his protective fat to buy everyone room. The venue is wrecked, but nobody dies.

The evidence is gone and the scarred man walks away clean, though the heroes now know his Quirk grants extreme acceleration with a recovery window afterward. Fat Gum's earlier history with Trigger is brought to light. Monika's manager lets Koichi and Kazuho slip away to catch their train, then hands Naomasa a Marukane Department Store card, on which the detective finds his own sister listed as event coordinator.