Decades after they saved the world, a band of brave heroes lives in peaceful retirement. Determined to make the most of their twilight years, Ferd the Hero and his wife, Elrica the Saint, decide to embark on one final journey to see their comrades.

Ridiculed for her outdated outfits, Agnes Evantail has been a pariah among her high society peers for as long as she can remember. Then she meets Nazelbart Florescruz, and the two are soon bound together in the most unlikely turn of events.

Twenty-five years ago, seven young heroes put an end to the long war between humans and demons, and their victory brought peace...until now. With the demon threat rising once again, can the seven heroes—now much older—save the world a second time?