Sasae Hatsushima loves his family and decides to protect them when, along with his stepmother and two stepsisters, he is summoned to another world where humans are seen as saviors: only they can stop the horde of undead that threatens all living beings. For this reason, when it is time for the four to give up part of their bodies in exchange for divine powers, Sasae thinks of a risky and crazy plan... From the author of Dead Tube here is the rawest, most exciting and unpredictable isekai, which breaks down the stereotypes of the genre with a "hero" ready for anything!