Izuku or known as Deku went on a mission but when fighting a villain he was hit in the head he blacked out while he was knocked out he had a dream it was about some one falling when he was woken up by the sound of his classmates talking in his hospital room

Lida: Quiet down! he's waking up!

after a chat he rested again but this time he was woken up by the sound of voices not from his friends

???: Hey just because we are ghosts doesn't mean we can't do anything! the cowboy ghost kid said to you the other ghost