Sealed Legacy III: Immortal? Been There, Done That

Mia Young once sealed the Demon Lord and entrusted the seal to her loyal servant, Noah Nord, unknowingly founding a family of demon subduers that endured for a millennium. Now, seeking to recover her lost memories, Mia returns to the Nords' residence to help them defeat the Demon Lord once again—only to discover that they plan to surrender and dismantle the Demon Seal the very next day.