Supernatural? Bnha X Reader X Black Butler

This story follows the plot of bnha. Not much bb until an incident accidentally occured, which is probably in the next 45 or more chapters.
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After rescuing eri from overhaul a mysterious portal arrives and takes them to another universe. How will the heroes in training deal with this incident. Will they get back home? Find out!
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Btw this book will start at the beginning. I mean the beginning of season 1. So for now it will only be a bnha x reader as time goes on it will be a crossover of the 2 anime and an xreader.