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High schooler Sasae Hatsushima has been summoned to a world of dark fantasy to defeat an undead army. That shouldn't be hard when he has the help of his hyper-competent stepmom and her two younger sisters, a high school karate champion and a girl genius! But to gain the powers needed for their quest, a great and painful price must be paid...And who better to pay it than Sasae, who seems utterly ordinary compared to his brilliant stepfamily?

(Source: Yen Press)