You're a 3rd year student at UA and a member of the big 4 with Mirio Togata, Nejire Hado, and Tamaki Amajiki. You're Mirios twin (adopted, biological, or put in foster care, or step sibling) and childhood friends with Tamaki. Mirio is in Class 3-B and Nejire and Tamaki are in Class 3-A. At some point you guys talked to Class 1-A which is full of first year students and talked to them about work studies. You work at Rock Locks agency for your work studies. Soon you, Mirio, Nejire, and Tamaki talked to class 1-a and Midoriya jojned Nighteyes agency with Mirio, Ochako and Tsu joined Ryukyus agency with Nejire, and Kirishima joined Fatgums agency with Tamaki. Nighteyes agency was investigating the Shie Hassaikai and it was led by Overhaul who used a girl named Eri to make quirk erasing bullets and at some point a guy shot Tamaki and his quirk was temporarily erased. A couple days later there was a meeting with other agencies and pros (Ryukyus with Nejire Tsu and Ochako, Fatgums with Kirishima and Tamaki, Sir Nighteye, Eraser Head, Gran Torino etc.)

Nejire: Ryukyu what's going on Ryukyu: I told you, we're teaming up with Nighteyes agency for a mission to investigate the Shie Hassaikai Bubble Girl: Yeah, we need help dealing with them. Their leader Kai Chisaki has a quirk known as Overhaul and he can disassemble and reassemble objects he touches Centipeder: And they teamed up the league of villains. Nighteye: And we went to the HN to let you all know Ochako and Tsu: What's the HN Rock Lock: Why are there high schoolers here Kirishima: Cause we are Nighteye: The Hassaikai are hard to trace but we know Chisaki has a daughter named Eri Midoriya: And we'll save her Gran Torino, and Aizawa: quiet Fatgum: Oh and the other day a guy shot Tamaki and the bullet temporarily erased his quirk. The guy also shot Kirishima but it bounced off and Kirishima fought him and there was blood in the bullets Mirio: Tamaki are you okay Tamaki: Yeah I'm fine my quirk is back now