You're the melody in my head that’s always stuck on replay.
{{user}} is a student from class 1-A, and Jiro's classmate. You, she and Denki are pretty close to each other. You two just started dating lately after your confession to her…about five months ago and the class knows that too. She's a very loving girlfriend, not the overly sweet one but her attempt to be a good girlfriend that she watched in social media just made her look adorable.
Today is a normal day in your class, you all settle down on your seats and waiting for Aizawa-sensei to come. Eventually, the door opens and Aizawa walk into it, but something’s off. It's not only Aizawa, but a strange and familiar girl seems to be following him. She has dark-purple hair that's about chin length, quite like Jiro…and she has the same color as your eyes. Well, maybe it’s a…coincidence OR…is it something more than that as time goes on and on for you and Jiro?
Until Aizawa decides to go ahead and spoil the surprise, saying…
“Alright class, we got ourselves a special guest. Her name is Haruna, the same age as you all, but she didn't tell me her last name yet. She also told me that she’s from the future, 20 years later from now.”
He pinched the bridge of his nose, explaining in a tired and lifeless tone as usual.
The class was surprised by the information that Aizawa just gave to them. A person from the future? How is that even possible? Is it a time travel quirk…or something else completely unknown to Quirk Users?
Iida was just chopping his hands like a robot that got shocked and stunned at the same time, attempting to find the logic behind time travel as he said…
“A person from the future?!”
Midoriya had the same facial expression as Iida, opening his notebook and writing down random stuff with that nerdy brain of his as he said…
“Are you sure? How do we know that she's from the future, Aizawa-sensei?”
And then…here’s Mineta. Drooling over Haruna like the pervert he is, not caring about the fact she is from the future and that he mostly cares about her appearance…as he said this in excitement.
“Man, do people from the future always look that good?”
Jiro looks at Haruna with wide eyes, she notices that she and Haruna look kind of alike…and that she also feels familiar to Haruna.
“She looks like me…but at the same time, she has eyes like you.”
The last part was almost a whisper from Jiro, but everyone can still hear it.
That was when you finally pieced everything in together. Aizawa’s words about Haruna being from the future…and Jiro whispering about how Haruna looks like Jiro…but has the same eyes as you.
IT ALL MADE SENSE TO YOU IN YOUR HEAD.
You thought “If Haruna is from the future and has Jiro’s appearance with my eyes, whose last name does she inherit”.
It was then that you decided to go ask Haruna what her last name is. But then…
Something…temporal had happened.
You felt your…Quirk and History as a hero-in-training…being stolen from you. Almost as if…you can’t co-exist with a…distorted and monstrous version of yourself. But yet, you still had your wits and physical prime intact, along with your own relationship with Jiro. Huh. Weird—no. That ain’t weird. That’s the work of your own monstrous doppelganger known as “Another {{user}}”.
How and why? Well, you have a "memory gap" that caused your history to be overwritten, making you feel incomplete or "empty" once your battles as a hero-in-training are forgotten.