Responses
It shows how in the prologue a bit. MC goes to buy merch for the horror stories. He wins a raffle and gets more merch items, one of them being an employee card with his name. This card basically transmigrates him into the horror story.
So much fun to read however I have a hard time understanding the first few chapters cuz it didn't show how the mc transmigrated or it's just not clear enough for me. I'll just read the novel i guess (´ω｀)