MTL - The Twelve Zodiac Guardian Gods - ~ Intro: Decisive battle. Everest

The End is finally here, but humans struggle and decide to fight to the bitter end and use all of their weapons. However, all of that was useless, and billions died.Until the first humans invaded the enemies' worlds and returned with powers after awakening them, they finally had the chance to fight back and defend their lands.Many years have passed, and humans have yet to obtain any real victories. Terry lost everything since the monsters and the overlords came to Earth, and he waited patiently and trained every day until he had the chance to awaken his power. Despite doing well on his first attack, Terry didn't awake any power...However, when he returned home, he confirmed that his power had indeed awakened... he could see weapons' status, and they could gain experience when he used them or killed monsters with them. Soon, he will come to realize that no other power is better than his!

“Compared to our time, the current generation just aren’t as reliable” they said, “Still, isn’t he the son of the Hero?” How annoying.

It’s been over ten years since the battle between mankind and the demons ended. The children of the heroes who saved the world are all grown up.

One of them, Earth, was a talented man, and everyone expected him to succeed his father as a warrior and defend his country, but Earth was always wary of his father’s title.

One day, Earth is shocked to find his father’s sword, which was used to overthrow the Demon King, sealed in his family’s mansion.

Because trapped within was the ghost of the Great Demon King who was unable to pass on and continued to roam the world.

For some reason, only he could see the spirit of the Demon King, and the Demon King possessed him through the sword.

Every day, forced to coexist with the spirit of the Demon King, they live a strange shared life, when the Demon King whispers to Earth on a whim.

“I have a grudge against your father. If you want to get back at your father and the world, I’ll train you. I’m free.”

Earth receives special personal guidance from the Demon King just to get back at his parents and the world.

Then, in the coming days. The hero’s parents, the heroes of the past, the first love, the princess childhood friend, the geniuses of the era, and the world will tremble.

Throughout this current life of mine, I will pay no attention to my past lives, nor will I seek future lives. I wish to live vigorously, to pay back debt of gratitude and fulfill duty to avenge, to defeat valiant heroes from all species, and to proudly laugh at all the Gods and Demons of the Six Path of Reincarnation!

- Description from Novelupdates