Satoshi Katakura lives a shut-in lifestyle, earning money through investments made with his grandmother’s inheritance. One day, he wakes up to find another world spread out beyond his house. There, he encounters two dark elf sisters who revere his grandmother as an “Evil God.” “From this day forth, we pledge eternal loyalty to you as our master!” What is the sisters’ true purpose? What is the real identity of his grandmother? The story could have taken a dramatic turn—but it doesn’t. Instead, a laid-back and fun shut-in life begins with his unusual new housemates.