Kazuki Hayashi was Earth's greatest swordsman until the day the Moon began to fall. In humanity's final hour, as reality itself tore apart, he made the ultimate sacrifice—wielding a forbidden technique that cost him his life but somehow delayed the apocalypse.
Now, 10,000 years later, he awakens in a world where the Moon hangs impossibly close to Earth, held in place by ancient seals that are slowly breaking. Magic flows through the world like blood, and humanity has evolved into various factions each wielding different aspects of the cosmic forces unleashed during the Moonfall Event.
But Kazuki isn't just reincarnated—he's been chosen by the Eternal System, a mysterious power that remembers every skill, technique, and experience from his past life and countless others who fought against the cosmic horror. As memories surface and his abilities return, he discovers that the Moon's approach wasn't natural—it was pulled by something that still hungers for Earth's destruction.
Armed with skills that transcend mortal understanding and the knowledge of his past life, Kazuki must navigate a world of sky cities, lunar cultists, and reality-bending magic while racing to prevent the true Moonfall that will consume everything