I dont know the name, but it had to do something with the slide. basically, the protag doesnt even remember who he is, but he knows the series of events of how he got here
Basically, he joined a place, and when he slid down he forgot everything, and he begs the reader to go down the slide so he could remember again
Not sure if it was some wild dream that i made (it probably isnt), but i swear it existed, and im sure somebody does too
(it was a few years ago too)