Can You Change Our Future[BSD/Bungou Stray Dogs]

A group suddenly appeared in the dirty alley around the Yokohama Prefecture. But somehow no one seem to realize they got there even if they are more than 20 people.

"If we lose the other part of this item Yokohama- No, Japan can disappear from the face of the earth!"

They seem to look for something, but what's the thing they look for? More importantly, what's the item and who are them?

{A/N:-- Arts are not mine♡}