Into the Deepest Most Unknowable Dungeon GN Vol 12 (MR)

(W) Kakeru VICTORY THROUGH MASSIVE DEATH!Confusion, deceit, hubris! When the old methods of containment fail, open war between humanity and the massive, hyperintelligent hydra is inevitable! The beginning of war may bring about the end of civilization; the end of war can lead only to new and bloodier conflicts! With no magic, no cheats, and nothing to turn to but their own resources and skills, the reincarnated hero from another world and his sexy allies must go all out in this hardcore adventure!