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The Elfuur sisters awaken as the Witches of Regret. Using their terrifying power, they face down the Demon Lord in his true form. "We should never have held hope." "We lost everything because we dared to hope." Maria and Caria run rampant with deep despair and regret in their hearts. What fate awaits those two? And what future will Takuto, Atou, and Mynoghra choose to pursue?!