Sick of tilling the family farm, a young man escapes to a nearby forest. Losing his way, he discovers a lake something unbelievable floating over it. A girl. A glowing, naked girl.

He fails to escape without her noticing, but she isn’t upset. Rather, she asks if he likes what he sees. She tells him she’s been waiting for him for three long years. She was once a supreme being but was attacked by a warlock who split her power into fragments and bound her to the lake. She can only escape with the young man’s help...or so she claims. He doesn’t believe her story. Yet between her genuine sorrow and brilliant seduction, he finds himself forming a contract with her—The Undying Blade.

Such is the beginning of their legend. They'll have to travel the world to collect weapons from countless legends and mythologies and battle all manner of vicious monsters in their quest to create the Ultimate Weapon.

And. There will plenty of cute girls along the way.