It was a sunny day and little five-year-old Rin and Yukio were at home playing Go Fish with Shiro. They were still in their school uniforms.(Shiro thought they looked adorable!) It came time for dinner so Shiro had to make their food. Rin and Yukio decided to play outside in their backyard. They played hide-n-seek. Rin hid behind a tree. He was peering around it, waiting for his little brother to find him when something pulled him from behind.
The person also clapped their hand over his mouth so nobody would hear his screams. The person set him down in an alley and uncovered his mouth.
The man had huge horns curling against the sides of his head. He had long black claws and shoulder length dirt-brown hair.He had on dark grey pants, work boots, and a brown T-shirt. His eyes were yellow with slitted pupils. He had a tail; the same color as his hair, wrapped around his waist.
He looked Rin in the eyes. 'He has his Mother's eyes,' Astaroth thought. He had Kurikara slung over his shoulder, brought to him by a group of his coal tars that had snuck into the monastery earlier. Rin looked back at him, his innocent blue eyes filled with curiosity. A strange child, indeed. Not afraid of a demon who kidnapped him, but curious.
"My name is Astaroth. I'm your big brother. I'm a demon." he paused to see how the child was taking this information. Said child nodded. Astaroth raised his eyebrows, but continued nonetheless. "I'm a demon King, The king of Rot. There are eight Demon Kings. You are a half-demon. Your mother was human. Do you know who your father is?" He asked. Rin shook his head. "Daddy told us that he found us in a watermelon floating down a riber and when he broke it open, he found us inside. But i dont think that was the truth..." the small boy answered. "Your father is Satan. He is the king of all demons. You will be full demon once you get to Gehenna. Gehenna will be your new home." Astaroth continued.
"Okay. But why?" Rin wondered. Astaroth sputtered. "What do you mean 'why?'" he asked. "Why would i be a King? I haven't done anything." Rin stated, confused. Astaroth sighed. Why must kids akways ask so many questions?"You will be made a king aftr a few years of training because you are the King's son." Astaroth said patiently. "Wait, so I'm going to be made a King, by my dad, who is also the King? Hkw does that mame sense?" Rin questioned. Astaroth dragged a hand down his face. "Your father is the GGod of all Demons. But he is our King, so that's what we call him because it would sound weird if we called him 'God Satan.' So the God Satan wil make You a King as the heir to his throne." Astaroth explained slowly.
"Oh. Okay. That makes a lot more sense. So why do you want me to go with you again?" Rin wondered. Astaroth groaned. "Gehenna is your true home, Little Prince. The humans want to turn you into a weapon to kill your own kind. So Satan wants you to live with him since your mother is dead." Astaroth told him.
Rin cocked his head to the side. "What about Yukio and Shiro?" he asked. "They are both only human. They will stay here, in Assiah. They cannot survive the atmosphere of Gehenna." Astaroth explained. Rin thought about this, then nodded. Astaroth smiled, showing his fangs. He held his hand out to Rin as a small portal appeared behind him. Rin took it and was picked up and held in Astaroth's arms.
They stepped through the portal.
Back at the monastery, Yukio couldn't find Rin anywhere! He'd already told Daddy. Shiro was looking everywhere too. An hour later, everyone met in the Sanctuary. None of them could find Rin. They gave up after a few months of searching. Rin was nowhere to be found. Eventually, they moved on. Yukio never forgot that day. He missed his twin.
So, in time, Rin was made the Ninth Demon King of Gehenna, Shiro trained Yukio to be an Exorcist, and Yukio grew up alone, succeeding in becoming an exorcist.