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From ancient times to the present, the world has always been divided for a long time and must be united, and for a long time it must be united and divided. And in the northern land called Heavenly Realm, it is also facing the crisis of disintegration as the power of the old king gradually fades...

Between the Kingdom of Heaven and other countries to the west of the northern continent and the War God Kingdom to the east, there is a valley sea that has existed for tens of thousands of years. In the world deep in the valley sea, in addition to undersea creatures, there are also sea tribes that have survived for thousands of years.

The time came to 2161, in a city with tall cyberpunk buildings, a boy named Losei accidentally put on a technological watch that was secretly developed by a scientist hidden in Bidu decades ago...