Most of 1A visit Momo in her room in the hospital with the expectations of Kyoka and Toru. There they comfort Izuku on her loss who cries. Eijiro and Shoto say at the same time "I think we should save him." with Eijiro explaining "I overheard you talking to the cops Momo, about a tracking device you put on the Nomu." Only for Tenya to argue "We should let the pros handle this." The two (Tenya and Eijiro) argue about it, only for Eijiro to say "You agree with me, right Izuku." After hearing his pleas class 1A argue about what to do with Fumikage, Yuga and Tsuyu to argue that "The pros should take on the job of rescuing Katsuki." The silence that fellows is only broken by the doctor coming in and saying "I need some alone time with Momo, if you all would please." Eijiro tells Izuku "Meet me behind the hospital after dark." Izuku then leaves but before she does so, she is given a thank you note from Kota by the doctor. On the roof Izuku reads the note and gets a phone call from his mother "Do you really need to return to U.A?" Her mother asked, only for Izuku to hang up on her. Shoto and Eijirō ask Momo to make another receiver for the tracker she made. She, Izuku and Shoto meet behind the hospital with Eijiro. Tenya arrives as well and laments "You guys are making the same mistake I made in Hosu, you thoughtless actions will further damage U.A's reputation." Izuku tries to convince Tenya but only to get punched in the face by Tenya. Tenya explains "It's not just Katsuki I'm worried about, I'm worried about you guys too." "Don't worry we plan on rescuing Katsuki covertly rather than physically get into a fight." Shoto says, only for Momo to say "I'll join you guys." "As long as Katsuki's in reach I can't help but want to save him." Izuku said, only for Tenya to say "If this is about Katsuki liking you." "No, it's not I would've still want to save him even if we didn't like each other." Izuku said, only realizing what she said after what she said. "Woah, you guys like each other" Eijiro said, only for Tenya to say "That doesn't matter right now, what does is I'm joining to and I'm sorry for hitting you, Izuku." "Why the sudden change of heart." Momo asked, only for Tenya to explain "I'm only going to be there to make sure a physical fight doesn't happen." Momo agrees with Tenya about going this route. "But first I got to do something." Izuku said, only for Momo to say "Okay but be quick." She said, only what Izuku was going to do would be considered crazy "Give me your quirk." Izuku said to All Might, only for All Might to say "Kid I'm glad you want my quirk but I'm about to face off against All For One, so I'm going to need all the power I can get." "Give it to me or I'll go rescue Katsuki on my own." Izuku said, only for All Might to say "What, are you insane?" "Am I"? Izuku said, only for All Might to say "Fine but after much physical training and..." Only to be interrupted by Izuku saying "I Am Tough, Make Me Buff." This spell instantly made Izuku fit enough to hold One For All. "All right forgot the training; I'll give it to you now but promise me you won't go after Katsuki alone" All Might said, only for Izuku to say "I can do you one better and magical make it into a bidding contract." "Okay but you also have to promise to keep the wand." All Might said "Agreed, From One Person To Another I Make This Act, That These Words Shall Become A Pact." Izuku said and then went on to say "They the dead is done." "Good, now eat my hair." All Might said "Huh?" Was all Izuku could say to that but she complied and did it. "Good now my power is officially yours." All Might said, only not to realize that this went all according to Izuku's plan, she magically promised she wouldn't go after Katsuki alone and she wasn't going after him alone, she was going with people.
They (Momo, Izuku, Shoto, Eijiro and Tenya) road the bullet train to Kamino Ward (where the tracker leads) when Izuku asks "What did the rest of the class say about this?" Only to be answered "The rest of the class tried to talk us out of it." By Shoto, even with this information Izuku decides she's not going to turn back. They arrive at Kamino Ward when Eijiro tried immediately to go after the bad guys but was stopped by Momo who said "If we go as ourselves, we'll be recognized on the spot. We need disguises." So that what they did they put on disguises with the exception of Izuku who did a disguise spell.
Her disguise was a short red wig to hide her long green hair, her mewni marks were hidden with makeup, a black jacket with a white long-sleeved shirt, light blue skirt with black shorts under it and black laced, black boots.
Momo leads them to what they believe is the villain hideout, only to find a Nomu factory. Only to find Mt. Lady and Best jeanist there as well and they (Mt. Lady and Best Jeanist) restrain the Nomu. "This was too easy." Mt. Lady said, only for Best Jeanist to say "The point of the raids wasn't for easiness, it was to find Katsuki and Ragdoll." Only for several portals to open up, spitting out the league of villains and Katsuki. "You see I needed her for her quirk because I haven't been able to stock up on any in a while." Said a mysterious man who came out of the shadows. Best Jeanist tried to restrain the man only for him to release an explosion. Izuku and the others are stricken with fear from this man especially after Izuku said "That's All For One, a man with the ability to take or give a quirk." She whispered, meanwhile back with Best Jeanist and Mt. Lady. Best Jeanist used his clothe fiber to protect himself and others from the explosion which All for One commemorates. "You're the mask man who is the ringleader of the league of villains" Best Jeanist said then attacks using steel fibers but is easily defeated by a blast of wind from All For One. "Your strength come from practice and experience, so your quirk isn't worth taking." All For One says. Meanwhile Izuku, Tenya, Momo, Shoto and Eijiro are stricken with fear while hiding behind a wall, Izuku tries to move but is stopped by Tenya. That when All Might shows up "Wow, look at your raw strength, you must be the ultimate bad guy." Katsuki said refuring to All For One, that's when All Might said "I will defeat you and lock you up for the rest of your life." also refuring to All For One. All Might rushes All For One but is repelled with an enhanced quirk combo attack. "Get Katsuki and flee the battle." All For One says to Tomura then All For One forcibly activates Kurogiri quirk to create a wrap gate. All Might returns and clashes with All For One while the remaining villains surround Katsuki. All Might can't get past All For One to get to Katsuki but Izuku's group has the ability to get to him. They use Katsuki's explosions to keep the villains (the ones surrounding Katsuki) at bay while Katsuki keeps his distance but Izuku worries that Katsuki won't be able to keep it up for long. "It's to bad we can't fight the villains ourselves, wait I have an idea." Izuku said, meanwhile All Might continues to scuffle with All For One while holding back all of his power to protect Katsuki from any potential shockwaves, Katsuki realizes All Might is holding back to protect Katsuki. Izuku puts his idea into motion while Katsuki has some distance between himself and the villains. Izuku's idea is Izuku and Tenya grab onto Eijiro while breaking down the wall using their respective abilities (Tenya using Recipro Bust, Izuku using Blueberry Blast) as well with Eijiro's Hardening. Shoto creates an ice ramp for them (Izuku, Tenya and Eijiro) to charge upward off of and into the air. It goes exactly to the plan despite All For One's attempt to intervene who is stopped by All Might's attack. After clearing the battleground at a great distance Izuku calls out for Katsuki for Izuku knows he'll listen to her. Katsuki listens to her and uses a giant explosion to go through the air and grab onto Izuku's hand. Then after Katsuki lands, they (Izuku and Katsuki) kiss. Mange tries to propel Mr. Compress at the fleeing group of students but is stopped by Mt. Lady using her Titan Cliff technique to grow in size and impede Mange's path. Mange tries to do it again but that's when Gran Torino show up and knocks them (Magne and Mr. Compress) out. "You know Izuku, this just reminds me more of All Might." Gran Torino says, only for All Might to tell All For One "I'm done holding back." Gran Torino readys himself to fight Tomura and Himiko. All For One forcibly activates Magne's quirk and magnetizes all the male villains to Himiko, pushing them (the male villains) through the gate at once. Alone to fight All For One repels All Might Detroit Smash by warping Gran Torino in front of it. All Might quickly recovers and grabs Gran Torino before All Might unleashes a Detroit Smash to counter All For One's spring-like limbs quirk. "You're still holding back for the bystanders nearby." All For One points out to All Might, only for All Might to say "I will not let you disrespect of your common man continue." and crushes All For One's helmet with a powerful strike. However All For One survives thanks to the fact that All Might use of One For All is depleting since giving it to Izuku. All For One declares that "Your declaration is similar to your predecessor's, Nana Shimura." Shoto and Momo escape the battlefield and Shoto speaks on the phone to Izuku "I wonder if it was alright that we left All Might to fight alone." Izuku says, that's when All For One says "You're too similar to your weak predecessor, All Might." This causes All Might to strike with anger but it leaves an opening which All For One exploits with an air canon blast which nearly causes All Might to crash into a media helicopter, only being saved by Gran Torino who said "He's taunting you like the last time you two fought, didn't you learn anything." All for One says "I feel conflicted about landing the final blow to hero society after my protégé worked so hard to ruin it. I despise you All Might because you ruined all I worked so hard to achieve. My reign, my plan for your quirk and now you ruin tonight which was me showing the world your true form." All For One then charges up another attack "Evade it." Gran Torino orders but All For One aims at a trapped civilian nearby. All might takes the blow of All For One's air cannon. In hopes of breaking All Might's will All For One says "You know Tomura is Nana Shimura's grandson." All Might struggles to believe it and All For One taunts him about smiling all the time. All Might thinks back to when Nana taught him that the strongest people are always smiling, but he begins to break down after thinking about if Nana could see Tomura's evil. All Might begins to despair, but the civilian he saved earlier encourages him to win. Everyone watching the battle begins to worry about All Might's chances of victory. Desperate, citizens (including Izuku and Katsuki) cheer for All Might by saying "Win All Might!" This gives All Might the confidence to win who charges all of his power (which is 15 percent of his usage of One For All) into his right hand (while staying buff) and tells All For One "Heroes have too much to protect to lose, so that's why I won't lose." All Might thinks back to what Nana said "Remember your origins and you'll never lose." Back in the present All For One levitates above All Might and prepares to blast him with air cannon. Endeavor and Edgeshot rush in to back up All Might, Endeavor yells at All Might "So what makes you the best." All For One tries to attack Endeavor but is stopped by Edgeshot rushing in to stop All For One. Kamui Woods arrives and rescues the injured heroes. "I commend you for your efforts, Mt. Lady." Kamui Woods says, Tiger recovers. All For One blows Endeavor and Edgeshot away, then All For One uses the ultimate combination of all his quirks into his left arm in his plan to crush All Might. "I know you passed on One For All and thanks to that my plan for tonight might still be fruitful." All For One punches All Might who matches All For One with his own punch with his enhanced arm "You have no control over your student and will die full of regrets." All For One says and uses Impact Recoil to push All Might back, only for All Might to say "No, I will live to reprimand my student." All Might focuses the power he's been using into his left arm (again while staying buff) and allows All For One to injury his right arm so All Might can and does close the distance between them and punches All For One, breaking off more of his mask. "Trick like that aren't normally in your arsenal and that's why it was weak." All For One says, only for All Might to say "My back simply wasn't in it." All Might remembers the moment that Nana gave him One For All. Back in the present All Might finishes All For One with a punch with his ultimate technique, United States Of Smash. All Might declares to the camera "The truth of it is this isn't my true form, this is." All Might then switched to his true form. "I got this form from a injury I sustained will fighting All For One last time don't worry it's been recently healed and I will be back to my muscle form being my true form in no time, please don't think less of me and that's not the only news my quirk is fading so I will spend the rest of it and my time at U.A teaching, that's right I'm retiring. So the heroes of tomorrow, it's your turn."