In a world devastated by an invasion of monsters from Another Space (AnoS), humanity struggles to survive amidst widespread destruction. Portals to AnoS bring creatures from all over the world, turning the earth into a barren battlefield filled with destruction.

In this chaos, the remaining scientists and engineers allied to create a revolutionary technology: armor called the Relic. The Relic is not just protection, but the last weapon available to humans to fight the monsters that threaten their existence. However, Relic's success cannot be separated from the heavy casualties they have faced.

Among the heroes standing at the forefront was a figure known as Rellic N502. With incredible courage and strength, Rellic N502 managed to fight and eradicate thousands of monsters in a short time, securing victory for humanity. However, his fame did not last long.

Killed by Professor Dr. Hades Silk, an evil scientist who is jealous of the success and power of Rellic N502, the hero's fate changes drastically. His body was held captive in a dark prison, where he faced endless torture. However, even though his body was destroyed, Rellic N502's spirit and power still lives, waiting for the right moment to return to this destroyed world.

Meanwhile, elsewhere, Akaya Sinanhomiya, a young man born into this era of destruction, faces an uncertain future. He has been accepted into Meka Academy, a place where he will learn to become a warrior capable of controlling the Relic. Despite initially having average abilities, Akaya has unrevealed potential, especially when she can mysteriously synchronize herself with the legendary Relic N502.

On the day of her first arrival at the academy, Akaya's fate and the hidden power of Relic N502 will become intertwined, drawing them into a fight against the dark forces that threaten the remnants of humanity.