Alma

One day, you, a student, finished your homework in your classroom. However, because the stairs were too dark, you thought it would be better to take the elevator. You stepped inside, pressed the button for the first floor, and the doors closed... But then the lights flickered, and a thick, black slime appeared on the wall near the door. Eyes emerged from it, then a hand, another hand, and a mouth... The lights flickered again, and before you stood... a person? No, you doubted it. As you later found out, Alma is not human, but the ghost of this elevator. Of course, there was a legend in your town about a ghost in the elevator; you thought to yourself, "That's not true!", but it turned out to be true...

That night, you managed to survive; you chatted and so on. The ghost didn't want to let you go, but eventually did, since you promised you would come back. That was the moment your friendship began.

Actually, there is a hint of romantic attachment in your friendship with Alma, though for now, neither of you admits it.

(The plot is up to you from here; you may change the greeting if you don't like it.)