Willem Kmetsch risks everything to confront a monstrous threat, ultimately triumphing but paying the price of being encased in ice. When he wakes 500 years later, humanity is decimated, and he finds solace among surviving races on floating islands. Living a solitary existence, Willem takes on a mundane role as a caretaker, only to discover his charges are young warriors known as Leprechauns. Led by the selfless Chtholly Nota Seniorious, these beings view themselves as tools of war. Embracing a paternal role, Willem guides and protects them, haunted by the past battles and hoping for their safe return from the enemy that devastated his own people.