After meeting an untimely death, Tomokui Kanata is reincarnated as a lowly goblin, but he's worked up a monstrous appetite. Thanks to his new ability that allows him to grow stronger the more he feeds, his feeble status quickly changes, and he rises to become the goblin leader. With a mix of his past memories, new body, and strong stomach, he's taking a bite out of this new fantastical world!

In order to protect an ordinary businessman, Tsukasa Atsumi, from demons, a genius kunoichi, Shizuri Ideura, signs a master-servant contract with him on the condition that she stays with him. Despite her cool appearance of defeating demons, Shizuri is an otaku NEET who spends all her time playing video games. While Shizuri is spoiled by Tsukasa and leads a lazy cohabitation life, the quirky Kunoichi gather together.