It has been 10 years since Izuku was kidnapped by the villains. He spent most of his time being tortured and experimented on, but he got a lot of chances with Kurogiri. He has taught Izuku everything he needed to know from primary to middle school. (Sorry if your not American but primary is the youngest you can attend school and middle is basically jr. high)
At the USJ
Kirishima: So manly, look they even have fake villains
Aizawa: 13 did you hire anyone to act like villains
13: That's the thing I did not
Aizawa: Everyone stay up here those are real villains
Shigiraki: Hello Students of UA, and ooh I see you have brought the Big Three but where is All Might
Kurogiri: N-no idea boss
Shigiraki: Well then separate the students and we'll kill them off one by one
Kurogiri: *good it is all going according to plan*
Kurogiri: (teleports up to the students) Hello students UA I need to tell you something that has changed me
After Kurogiri explained
Kirishima: For someone who is a villain, you sure don't act like one
Kurogiri: Sigh.....I wasn't always like this
Shigiraki: Kurogiri send in the ink demon
Kurogiri: Y-yes Shigiraki
The demon formally known as Izuku Midoriya walks in to the building and immediately sees Nejire.
Kurogiri: You blue haired girl you are the first person he spotted so you need to do this the only downside is that he will be overly attached to you
Nejire: If it's to save a person's life I don't care
Shigiraki: Ink Demon attack the first student you saw then finish off the rest
Izuku starts running after them
Kurogiri: Do it now!!
Nejire: Izuku Midoriya..... Your mother told me she was very proud of you and she hopes you can fufill your dream of becoming a hero
The Ink Demon stoped running but started casually walking with a slight limp to Nejire
Kurogiri: Good now he should listen to you but you need to tell him that the students are your friends so he doesn't kill them
Shigiraki: CHEATER THE INK DEMON WAS SUPPOSED TO KILL ALL MIGHT! WHY IS IS LISTENING TO YOU!!!!
Shigiraki: Kurogiri get me out of here
Kurogiri: Yes Tomura
After Kurogiri teleported Shigiraki he stayed behind until the heroes showed up
All Might: Villain stop your evil dongs right now
Nejire: Actually All Might-Sensei he helped us
Midnight enters
Kurogiri: Nemuri it's good to see you again
Midnight: Do I know you
Kurogiri: Well my name now is Kurogiri but my name was Oboro Shirakumo
Midnight, Aizawa, and Present Mic's eyes started to water up
Aizawa: W-What happened to you
Kurogiri: If you allow me to talk to the principle to be able to stay at UA I'll explain all
Snipe: Nejire what is that thing
Nejire: The villains called him the ink demon but it turns out his name was Izuku Midoriya
Snipe: Wait All Might didn't you say Izuku Midoriya was the name of the kid who went missing 10 years ago when his mother was killed in a villain attack
Bakugo: I-is that really you Deku
The ink demon could only let out a small fragile sound but it was clear enough to sound like a distorted voice
Ink Demon: Kaachan
