Author: Ooyama Takumi (Lee Gyuntak / Simhaesu)

Leviathan is a gripping post apocalyptic survival manga that blends sci-fi, horror, action, and psychological thriller elements into a dark and intense story set in a world completely consumed by the ocean. After a catastrophic cosmic event triggers endless rain and rising sea levels, Earth is submerged beneath water, forcing humanity to abandon land and struggle for survival at sea.

In this drowned world, terrifying mutated sea creatures known as Leviathans dominate the depths, turning the ocean into a deadly battlefield. The story follows Bota and his family, who drift across the vast, unforgiving ocean on a small boat, constantly facing hunger, fear, and monstrous threats lurking beneath the surface. As night falls, the danger intensifies, and survival becomes a desperate fight against both nature and unknown horrors.

With stunning visuals and a tense atmosphere, Leviathan explores themes of human survival, environmental collapse, family bonds, and psychological endurance. Perfect for readers searching for “post-apocalyptic manga,” “survival manga online,” “ocean horror manga,” “monster manga,” and “Leviathan manga read free.” This series delivers a thrilling experience filled with suspense, action, and emotional depth in a world where hope is as rare as dry land.

Alternative Titles:
Leviathan / Deep Sea Monster / DeepWater / Leviatán / Léviathan / Simhaesu / 深海獸 / 深海兽 / レヴィアタン ～深海に棲む獣～ / 몬스터 심해수