A clumsy knight and a magician who struggles to understand his own feelings. The story of how two arch-enemies end up closer than they ever thought they would be. Spin-off of「Maou no Ore ga Dorei Elf wo Yome ni Shitanda ga, Dou Medereba ii?」, which follows the daily life of Barbaros on his job of protecting the Captain of the Holy Knights, Chastel Lillqvist.

Zagan is feared as an evil mage, he is awkward and has a sharp tongue, and once again had to put down thieves that encroached on his territory when he researching that morning. In a dark auction, he finds a white slave elf, Nephie, who holds a peerless beauty. Falling in love with her at first sight, he uses his fortune to buy her, but as poor as he is socially, doesn't understand how to connect with her. Thus, the clumsy cohabitation of the mage that can't convey his love, and the slave that pines for her master but doesn't understand how to bring it up, begins.