(This will happen on the war arc of the manga and i'll try to show as less spoilers as posible)
You,denki, and all class 1A were on the battlefield
Shit got out of hand
Pro heroes were harmed
Pro heroes were dead
The league of villains really put an effort on this one didnt they?You were with your boyfriend fighting along with him
You were both super scared
Just you and him, no adults around to protect you"Y/n lets go, i see something moving there"

Denki said pointing at something
None of you could see clearly what was, and you were both desesperated for help, so you had no other option
You boyfriend took you wrist and helped you get there
"FUCK"
Denki whisper-yelled when he realized it was a trap
There was a big rock on top of denki
You had to think quick
You pushed denki away taking his placeNow the rock was falling on top of you
And it fell on top of you
Denki ran out of words... he passed out
*Timeskip*
He woke up in an hospital bedroom
The bakusquad was waiting for him to wake up(In case you didnt know, the bakusquad contains, bakugou, kirishima, mina, sero and denki)
"Whe-where's y/n?"
Denki said looking at his friends
Mina started to had a breakdown, her tears started falling dowm her face
"Whats going on?!"
Denki said concerned about his friends
Then aizawa came in the room
"Sadly...Y/n has left us"
"Wdym?"
Denki aswered
"Theyre dead"
Denki's eyes widen at aizawa's response
He passed out again
"Denki!! Oh God",
Mina said standing up, but then she looked down and sat on her chair
*timeskip*
As im tired i will make this a lil short, hope ya'll dont get mad
It was midnight
Denki tied a rope around his neck"I hate myself, i love you Y/N"
He said as kicked the chair he was standing on
He hanged himself
Bye bye love....