“Malignant Core: The Cancerous Dungeon

At just 17, Rei Tanaka dies from an aggressive, untreatable cancer. But death is not the end. Instead, Rei awakens in a dark void, hearing a voice calling him “Dungeon Core #C-001.” His soul has been reborn in a different realm—as a living dungeon, a being that grows by luring adventurers and consuming their energies.

But something went wrong.

Unlike other dungeons, Rei’s Core is made of cancerous essence—mutating, replicating, and evolving without limit. His dungeon is alive, ever-changing, impossible to map, and horrifyingly organic. His monsters are cancerous aberrations: flesh-made slimes, tumor wolves, parasitic spores, and grotesque mockeries of heroes.

Will he become a disease upon the world?

Or will he fight fate and reshape his malignancy into salvation?