What if your favored TPN and Demon Slayer crosses on one path? They all met in a manner where they didn't even expect... What future lies beyond their world??

This is basically a crossover between The Promised Neverland and Demon Slayer. An anime which struck my heart the moment I watched it and listed as my favorite animes. ~~~~~~~~~~~~~~~~~~~~~~~~~~ Whilst busy with their stuff, Tanjiro's group were called into the headmaster's room. They are assigned to one mission that will soon change as they continue to move forward. On the other hand, a bunch of innocent kids were living happily in a house in which they wouldn't know what keeps them from going outside. They are so curious and because of that, they tried to look for clues. But what lies beyond their mission? Beyond their Curiousity? Will they soon find the answer or will they accomplish their mission? What kind of event will the world become once the unexpected came out of hand? Read the story to find out!