Fnaf Missing Child Cassidy!Reader x Honkai Impact 3rd x Fnaf Crossover

Y/N and a Group of Kids were killed by William Afton at age 10 or younger but they could not go to the afterlife because of their anger towards Mr.Afton but fate has different plans for these Missing Children and decided that they were to be brought to honkai impact 3rd universe but how will Y/N and Her Friends move on from the past and how will they be able to save the honkai world from destruction.