Free The Dungeon

If there is a dungeon, there must be a dungeon's core responsible for managing and strengthening the dungeon, the strength of the dungeon is based on the number of levels.

Each floor of the dungeon must have a monster head protecting their floor, and every head of the monster must have the subordinate according to his direction, each subordinate will surely die to protect their area.

This story tells of a weak monster Fight to free the dungeon of his master first from humans.