Yuko Katsuragi was orphaned young and lived a quiet, steady life-until his 18th birthday, when everything changed. On that night, shadows began crawling from the ground, merging with passing strangers. Driven by curiosity, Yuko followed one shadow as it fused with a man, unknowingly setting off a chain of events that would alter his life forever. In the chaos that followed, Yuko encounters a mysterious, oddly dressed man-who reveals he's family.

"I came from a floating nation above the clouds. I was prophesied to live a miserable life and brought here to live normally."

Now, with his newfound origins and a strange destiny looming, Yuko struggles to navigate the life that's been thrust upon him.