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Roland, a modern man reborn as a prince in the dangerous Border Town, rescues the witches Anna and Nana Pine from the Church. Harnessing their extraordinary powers, he fuses magic and technology to craft weapons, armies, and steam engines to defend his people. As the Demon Moon rises and conspiracies close in on his family, Roland must lead a revolution to protect his allies and reshape the world.

(Source: Crunchyroll)

In the distant future, on the outskirts left behind by the rapid concentration of advanced science and technology in urban areas, lies a remote mountain village known as Kagami Village.
“Behave yourself, or a Double will come for you.”
Such old folklore still lingers in this village.

Akane Higure, a middle school student living in Kagami Village, has been eagerly awaiting the return of her older sister, Sui Higure, who is finally being discharged from the hospital after a year.
However, not long after her sister comes home, Akane receives a single phone call.

“The girl at home with you… isn’t your sister.”