I Became Partners with a Mermaid to Save the World

Gods and demons descend upon the world.

To save the world, Lin Jianlu manipulated time, forcibly entering into an ancient contract and returning to the past.

At the same time, the sealed entity he had made a deal with kindly told him: In the deep-sea city of R'lyeh, a pearl is sleeping. Its breath is the cradle of the ocean. It is the master of the sea, holding dominion over [Life], [Birth], and [Death]. In other words, it is also the master of the underworld. If he could find it and win its help, it might be possible to fight the gods and demons.

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A certain sleeping deity woke up and discovered that they had gained a partner.

[Note]

A story about leading a nation to save the world

Theme: Protecting one's homeland and defending the country, resisting invasion