In ancient times, the demon lord Rchimedes instilled terror in the world until he was defeated and sealed away by the heroic Creasion. An era of peace endured for a thousand years until a mysterious interdimensional rift opened, unleashing countless demons into the human realm. The human king fears Rchimedes' return and summons potential descendants of the hero, but their identities remain elusive after centuries. Among the candidates is Alba Frühling, an inexperienced adventurer, and his comical misadventures are accompanied by the seasoned warrior Ross. They embark on a journey to defeat the demon lord, meeting a varied cast of characters along the way.