Main CP: Seth & Muto Yugi & Atum
Because of the Millennium Building Blocks, Muto Yugi traveled through time and space and returned to the ancient Egyptian era more than 3,000 years ago, and got to know Set, the pharaoh at that time.
To Muto Yugi's surprise, the young pharaoh's appearance was strikingly similar to his high school classmate Seto Kaiba in the present world.
The young Pharaoh's meticulous, gentle and considerate care of the newly arrived Muto Yugi made Yugi's heart sink without reservation. When he handed over his body and mind to the young Pharaoh, he heard a strange name called Atum from his mouth.
In the end, he realized that he was just the comfort of the young Pharaoh when he was lonely...
The young pharaoh's heart never stopped for Muto's game.