Spoiler Warning: Plot and/or ending details follow!!
History
Yumeto is a second child from poor family and younger brother of fortune-teller Yutarou. Yumeto was born with a congenital defect in his heart due to have a mysterious disease. His brother tried to search for the nearest hospital but to no avail. Yutarou was forced to work as a fortune-teller to raise enough money after graduating from Hakujitsu High School. Despite his illness, Yumeto began to pay attention to the stars and began to studying astronomy. After his brother was surprised by his skill, Yutarou decided to give Yumeto a PlaWrestlers Horus and Sphinx as a gift he had kept since he participated in WPWE.
When their father began to get sick, Yutarou could not save his money because they were a poor family. But his father tells him to let Yumeto go to school on the pretext of teaching, but Yutaro can not leave him because of the mysterious illness. By accident, the hamsters Yuu-chan found a talisman that takes the form of the woman-headed snake. It's Wadjet Amulet that his father brought it from Egypt and Yumeto began able to wear it. As the Eye of Horus is glowing on his forehead, Yumeto witnessing the real Horus from the ancient Egyptian mythology banishing Set by placing him in the Sarcophagus and sealed him for good. Since there no cures for it and before their father died, he told his son Yutarou to keep Yumeto alive and never let him tells a truth about his disease.
After their father's death, Yumeto began to cure his disease and wears the Horus Mask to keep it for himself. Yutarou sold their house and start to move together to Hoshiakari, where Yumeto's brother enroll Hakujitsu High School. Yumeto takes the long walk and befriended with the monk Hibiki Rokukawa and become the best friends until he grow up. Yutarou told Yumeto that never tell them about secret before he leaves Hoshiakari with Yuu-chan, which Yumeto is left along. Now 16 years old, Yumeto leaves the shrine and being to enrolls Hakujitsu High School with Horus and Sphinx to start his new life, hoping to pursues his dream one day.