After the death of rengoku you passed out and later on the floor passing out from the stress of rengoku's death and the strain the injuries put on your body. While passed out the events in the anime carried out.
The students had been defeated and the villains had escaped with bakugo. They took the heavily injured students to the hospital. When you last woke up you realised that you were the only student in the hospital all the others had left.
Beginning of the scene:
You awoke and realised no one was near you, then the door opened and momo came with a worried look on her face.
Momo: YYYYYYY/NNNN!!?????? Your awake!!!
Y/N: huh
Momo: you'd passed out after the fight with the villain.
Y/N: *cold stare* y-yeah.................
Momo: don't worry though the heroes came and saved everyone but before that bakugo was kidnapped by the villains
Y/N: W-What!!!! Ahhhh that's not god is it then........
Momo: no but everyone has been worried about you, you even had some visitors from your internship. They told me to give you this bird once you woke up
Momo brought out a bird she had been carrying from her hand it seemed to be a crow:
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The crew flew to your shoulder and gave an announcement:
Crow: Y/N is to immediately depart to report to ubayashi-sama at the mansion along with the guidance of one of the kakushi (some of the helpers in the demon slaying Corps)
Small time skip
Once u were taken to the secret hideout mansion they removed the blindfold from your face and you saw a lovely patio which you assumed to be the meet-up point
The master of the household sat on the edge of the porch and smiled
Y/N: u-ubayashi sama?!?!!
Ubayashi: well, how lovely you have mad it here safely, and no need for the formalities just call me oyakata-sama
Y/N: yes sir, so what is it you called me here for
He puts on a serious face and asks you
Oyakata: as you experienced you had a run in with the Upper moon 3
Y/N: y-y-yes sir he was *tearing up* t-the one who killed Rengoku-san
Oyakata: yes it seems that our beloved friend rengoku has passed due to the encounter with the upper moon
