In a world where unknown horrors lurk, a young man witnesses the death of his winged mother as a "fallen angel". He learns that his mother faked her accidental death after being brutally experimented on, and is determined to embark on the road to revenge. On the way, he encountered a tumor-eyed octopus covered with eyeballs and tentacles, and was rescued by the "Evil Slaughter Squad" at a critical moment. With in-depth investigation, it was discovered that the city had long been invaded by monsters. Terrifying beings such as the "Swamp Creeper" run rampant, and the boy himself has become the target of both monsters and mysterious organizations due to the special physique inherited from his mother. In Cthulhu-style despair and madness, the boy plays a dark movement about alienation, redemption and unknown fear in his journey of revenge and survival on the edge of the abyss.
