Two_Constellations
Two friends find a strange portal in their attic. Curious, they pass through it. That's when they realize that they have entered the Black Butler universe.
Shortly after arriving, they discover the portal has shrunken in size! Who knows how they will escape? What will it take to open the portal? Of course, we know ha-ha!, but you gotta read the story to find out! I can't just tell you! :P