C600 I've Guessed It!

"We felt like our bodies were being pulled by a black hole, and then we saw ourselves flying towards the black hole. When we woke up, we were in a mess."

"At a place closer to the center of the forest, we were still wondering what was going on when all the corpses, blood, and the boss disappeared. We didn't know what happened."

"We only knew that we were in an instance dungeon