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It has been 50 years since the end of the first Demon World tournament. Yusuke had retired from being the spirit detective 20 years earlier and was now living in happiness with Keiko with the occasional visits of old friends. Genkai had passed away 30 years prior to the start of this story from old age. Kuwabara was retired and living with his wife and two kids. Kurama cared for his mother until her passing and now takes care of her house. Hiei eventually left Demon World and left to the seclusions of Genkai's temple. Yukina is still unaware of Hiei being her brother. Koenma overthrew his father and became the new King of Spirit World. Koenma decided that in order to be a king, he had to look like one and is almost always seen in his 'teen' form; only Ogre sees him as a kid now. Life has been good to the former spirit detective and his friends and family. However, there is one last mission for him to complete and it will be his toughest yet since it is an enemy who has been in seclusion since before Koenma was born. This is where the story starts…

Yusuke sits at the dining room table across from his wife of 47 years, Keiko. They had been living the good life in their two-floor home. Yusuke had retired as spirit detective 20 years ago and was renown in both the spirit and demon world. However, Yusuke was getting older and his powers were slowly starting to dwindle, just like Genkai's. Koenma was reluctant to let Yusuke go because of his tremendous success at winning but he knew that Yusuke's time had passed and it was time to let someone new take the reigns, since, unlike previous detectives, Yusuke could age. Yusuke hadn't really trained since retiring but still kept himself in very good shape. His slick black hair was now a dark grey. He wore a black t shirt and khaki pants. He and Keiko had a child, Hikari. He had no idea of his father's greatness. However, when Koenma came to see the child when he was born, Yusuke was told that Hikari had unbelievable spirit awareness and an incredible amount of energy within him. Koenma inspected the child further at the age of 14, unknown to Hikari and Keiko, to find out the boy's strengths and weaknesses. The boy had a lacking in physical strength but unbelievable spirit strength. The boy could become a more powerful psychic than Genkai in her prime. When Koenma asked Yusuke if he would allow his son to take over as the new spirit detective, Yusuke had no trouble with it, but Keiko said that she couldn't handle the pains of having a loved one as the spirit detective once more.

However, on this day, old friends will be reunited, new enemies will be made, and the arriving of an evil so ancient that it goes back to the time when Spirit world was controlled by TWO men. A king and an Emperor. It was 11 AM. Yusuke had woken up 2 hours previously and was watching TV. Keiko was in the kitchen making some breakfast as their son of 15 was reading a book for school. Hikari had never been a tough kid like his dad but he wasn't a book worm either. At 11:20 AM, a knock was heard at the door. Keiko walks over and opens the door.

"Hello, Botan. Its been quite a while. Wow you haven't aged a day."

"Yeah, I know. By the way, is Yusuke here? It's very important."

"Of course, he's in the living room."

"Thanks. YUSUKE!" Botan screams as she runs into the living room, causing Yusuke to leap from his seat. She sits down in the chair near the sofa as Yusuke gets back to his sitting place. Botan and Yusuke talk while Hikari leaves for school. The moment he is gone, Botan gets very serious. She asks Keiko to come over and sit with Yusuke.

"Keiko, Yusuke. This is very important."

"What is it?"

"You need to have Hikari trained right away."

"Botan, I thought we had this discussion last year, I don't want my son to end up like Yusuke did all those years ago and keep leaving me and keeping my heart filled with fear. My soul felt like it was about to snap near the end but my love kept my heart together long enough until he returned I don't think I can go through it again."

"I'm sorry, Keiko, but this is not an offer. Hikari must be trained at once."

"WHY!" Keiko screams with tears starting to flow from her cheeks.

"Koenma has been informed of something that could result in anarchy of all three worlds." Yusuke takes notice of this.

"Who's the problem, I'll take care of it." Botan looks at Yusuke with a concerned look on her face.

"Yusuke, this enemy is unlike all previous opponents."

"Everyone always tells me that…"

"THIS TIME IT'S FOR REAL, YUSUKE!" Yusuke was taken aback, "This enemy has a history that goes back further than you can believe. If King Yamma was God, than this man would be Satan."

"Wait, Koenma overthrew his dad a while ago."

"That's right, Yusuke. King Yamma was the King of Spirit World longer than I could remember, but there was once another. There was a time when Spirit world was split into two sections, cut by the River Styx. Yamma controlled one side and this man controlled the other. Yamma was a powerful physical fighter but this other man was the greatest controller of spirit energy ever. He makes Kuwabara's spirit senses seem pathetic. There were many battles between the two lords and many lives were lost on both sides throughout the years.Yamma was believed to be the righteous one and thought of as more of a 'man of the people'. The other man was thought of as a tyrant who only wanted more power."

"Who is this man?" asks Yusuke.

"He is the mystical Terminus. He is an ancient being that goes further back than Yamma himself. When Yamma came to power, Terminus had been in power for more than a millennium. We believe that somehow, through Yusuke's return to the demon world, the birthplace of Terminus, Yusuke somehow came in contact with some of Terminus' DNA, causing your son to develop some of his powers. Your son is more able to cause physical damage but Terminus is unstoppable when it comes to the powers of the mind and spirit. It is actually believed that Genkai and Toguro went searching for a spell book that Terminus wrote long ago in search for the secrets to his power. Genkai found a torn page, thus creating her Spirit Wave Orb. However, the moment Genkai learned it, it burst into flames, never to be seen again. Anyway, to the point. We believe that your son has the DNA of Terminus in him and we need to train him in order to protect the Spirit world."

"Still, why do you need him?"

"We have discovered that Terminus wasn't killed. History has it that Terminus was finally killed by King Yamma in their final confrontation, causing Yamma to gain control of all of Spirit World. However, we have found out that that is not true."

"How?" asks Yusuke.

"We saw him. Koenma sensed him and went to the ruins of Terminus' citadel. There Koenma found Terminus sitting in his ancient throne. We believe that Terminus is going to try to retake control of Spirit world, take the Demon world, and then no one will be able to stop him from taking this one." Keiko cries as Yusuke simply nods.

"Botan, I need to see Koenma right away."

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