1932. As the ominous footsteps of a turbulent era begin to echo, Eiko, the young lady of an elite aristocratic family and her cross-dressing female chauffeur Becky race through the changing times! (Source: Big Comics, translated)

[In a world where resources are running out and people are falling into ruin, the war with the Demon King's army is compounding the suffering of the people. The hero, who was their hope, has died, and the people are on the verge of death, unable to even stand up to hunger and disease, but the Demon King himself, who defeated the hero, reaches out to help them.] A nation-building adventure fantasy in which the Demon King creates a country in a world after the hero has been defeated. Original Raw: urasunday.

Manga Cross describes the manga as a "panic survival" story, with the manga's tagline reading, "Survive the man-eating deep sea creature!" (Source: Anime News Network)