After his father's remarriage, high school student Sasae Hatsushima moves in with his three new step-sisters. That's all well and good, until the whole family is summoned to another world! Will they be able to band together and survive in a brutal, unforgiving land?

After his father's remarriage, high school student Sasae Hatsushima moves in with his three new step-sisters. That's all well and good, until the whole family is summoned to another world! Will they be able to band together and survive in a brutal, unforgiving land?