High schooler Sasae Hatsushima has been summoned to a world of dark fantasy to defeat an undead army. That shouldn’t be that 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 powers needed for their quest, a great and painful price must be paid … And who better to pay than Sasae, who seems utterly ordinary compared to his brilliant stepfamily