Ichiban Ushiro no Daimaou - Volume 8, Prologue

Someone once saw me at the end of the world and respectfully called me the serpent that coils around the world—Jörmungandr.Someone once gazed upon my form at the edge of the Underworld and called me an ancient serpent—Satan.I was also feared by the gods and was called the hundred-headed dragon—Typhon.I have had many names—the serpent of creation, the serpent of sacrifice, the serpent of ceremony, the serpent of the world...But I have wandered through the chaos and arrived at the wilderness. There is only one divine name—the Primordial Ancient Serpent, the origin of everything.

“When I left you, it wasn’t because I was materialistic.”

“I know.”

“He doesn’t love me. I already broke up with him.”

“I know.”

“You knew? I didn’t know you were still so concerned about me…”

“I know because he and I are now a couple.”

This is a story about how a poor loser turned into a tall, handsome and rich guy and snatched his ex-girlfriend’s current boyfriend away.

- Description from Novelupdates

Reborn in the world of Naruto as the Nine Tails, he finds himself sealed within Uzumaki Kushina. No longer just a mindless beast, he possesses his own will, intelligence, and the power to change the fate of the tailed beasts.Madara : I never thought that my Rinnegan would be crushed by Nine Tails.Hashirama: Times have changed. I once controlled the Nine Tails, and now the Nine Tails controls me.Uchiha Mikoto: Kushina, I didn’t expect you to have something this powerful sealed inside you.Uzumaki Kushina: Each of the Nine Tails' tails gives me a different feeling.At this moment, the Nine Tails stood tall, representing all the tailed beasts.“Tailed beasts will never be slaves!”

Ash opened his eyes to find that he had traveled to a strange nation of many races, and people were kneeling before him.Before he had time to adapt to the new identity of the Terminus Observer, he was put to jail – as a cult leader.In prison, controlled by a high-tech chip, he was unable to use violence. He also lost all his memories due to the time warp.How could he escape from the prison full of ogres, green-skinned beasts, sorcerers, and elves in this strange nation? And how could he survive the legendary Blood Moon Judgment?“Ding! You obtained a game system – Mage Manual! It includes an illusory world map, which can predict risks and gains, helping you find advantages and trouble, and greatly improve exploration efficiency!”“Ding! You obtained Deadly Berserker Sword Maiden! You can share all skills and upgrade together with her!”“Ding! You encountered an Illusory Vortex! Go straight through the heartland of the Illusory Realm and harvest a lot of experience to create the Silver Wing!”...Is this the legendary system? It not only gives me free skills, but also a skillful fighter?Ash discovered that even though he was in the Otherworld, he could dominate his own destiny with the system, and even...dominate the entire Otherworld!