Chapter 98: M-Island Mission begins
When they ran back at the castle, Izu ask his friends and half siblings why they decided to run away instead of fighting the League of villains, causing Kyoka to explain that the League of Villains seems too powerful to handle, which also caused Izu to give her a deadpan look before chewing everyone out for running away and told everyone that just because they're kids doesn't mean that they're defenseless and weak. He then reminded his friends about past villains except Merlin, which they fought together before reminding everyone that they are strong and if their parents need saving, they must be the ones to do it. He then wrapped it up by asking who will help the heroes when they need saving, causing the Yagi kids to become determined and told the Peanut Gallery that they may not have quirks like their father All Might, but they will not let villains ruin their vacation. Everyone then cheers before heading to the throne room to have a meeting to fight the League of villains. Izu then told Siri to look up Dynamaxing light after Maggie shows everyone a crack, that's getting bigger near the castle with light showing inside before Siri told the kids that the light is extremely dangerous, and it'll destroy the island if Mortimer doesn't become king. Everyone then gets confused before Izu told everyone the strategy to take down the League of villains. He then told the Yagi kids that they will work together in mission control, causing them to look at their fists in determination before agreeing to do their part.
That night, the Peanut Gallery got their costumes delivered by the bot mights before heading off to confront the villains at their hideout in Gamble Harbor. Soon, Pony breaks the entrance to the harbor open with her head before Tyler told the team that the League of Villain's hideout is near the beachside casino, which caused the Peanut Gallery to head out until they see Eternatus sleeping and sneak past him. The kids then reach the door of the hideout, causing Audrey to tell them that it looks like a puzzle that need to be solve for the door to be open. Yui then volunteered to open the door with her brother Oki, which works as the door opened after Yui and Oki solve the puzzle in exactly one minute.
The Peanut Gallery ran inside the hideout until Sam told them that the villains have minions patrolling the place, so they must be careful. After Mina asked what kind of minions they're dealing with, causing Sam that some of the minions have weapons like guns, knives, and bombs. She then said that some other minions are big and muscular while the rest has quirks similar to pro heroes back in Japan. The Peanut Gallery then deal with the first three wave of minions before avoiding been seen in a room full of minions, who are ready to ambush them. Soon they reach a machine with a timer, which means that the kids don't have much time to fool around and if they don't shut down the machine before time runs out, the dynamaxing light will destroy M-Island for good, and the League of Villains will steal one for all for All for one so Mortimer will be king.