Anyone with This Face Facing Up

The world is a cube. Only the side facing upward is alive. The remaining five sides are always in collapse. When civilization develops to a certain extent, its collapse begins to erode from its borders until the entire world is swallowed up. The cube is then turned over, with the new side facing up, and a new civilization starts from scratch. Longsail is the only surviving human of the Old World. He's been through too many reboots. Every time I wake up, it is a new world, a new race, and a new civilization. He has seen civilizations rise and fall seven times, seven different ways of failure. Not once has the collapse been successfully prevented. What woke him up was a robot named Xi. She does not remember her origins, but only knows that she was created for the sole purpose of protecting Changfan and helping him solve the problem of entropy. She founded the multinational company "Guixu Enwu" on her own and operated in this world for decades, waiting for him to wake up. But this time it's different. Chang Sail discovered a variable that had never appeared before - a tide spirit girl named Tide. She is the only survivor after the fall of Yuan Kingdom, and the only one who can see the true form of the border. Her very existence may be the only hope to prevent a reboot. Yet borders are shrinking at an accelerated pace. There are only 20 years left for Chang Sail. This time, he must find the answer. Because there is an old wall at the bottom of the sea in the seventh reboot. The words on the wall were carved by his own hands—— "Everything facing upward is my grave."