Buried Bones in Kyushu

When Hou Ye was squatting in the garbage dump eating moldy bread, he didn't know that he would be the one to open the door. Nine descendants, nine keys, a door that has been sealed for five thousand years. Outside the door are invaders pouring out, and inside the door are all the dead heroes in history. As soon as the door is opened, the heroic spirits are fully awakened, and the invaders can get in but cannot get out. This is a war with no retreat.