Minato Sato just wanted to study core theory. Instead, he bonded with a parasitic dungeon fragment. A corrupted weapon designed to infiltrate magical academies and overthrow the System. Now he shares his mind with an alien consciousness, watches a corruption meter climb toward 75% irreversible, and faces an impossible choice: partnership or domination. At Blackspire Academy, Minato discovers that symbiosis is the third path between servitude and dissolution. But every power-up costs his humanity. Every infection event brings him closer to the threshold where he'll either transcend... or become the monster the hunters were created to kill. The System demands obedience. The dissenters offer war. Minato chooses partnership—but at 75% corruption, consent is the only boundary holding back the abyss. The Dungeon Symbiosis Chronicles — where corruption is the mana bar, symbiosis is the skill tree, and every power-up has a cost.