The story of Mairimashita! Iruma-kun follows Iruma, a kind-hearted 14-year-old boy whose parents sell him to demons for their own selfish interests. However, the demon he is sold to has no grandson of his own, so he dotes on Iruma and sends him to demon school.
In the 15th century, Vlad III, king of Wallachia, was in deep despair after his beloved queen was killed in battle. He cursed God and vowed to live forever in the darkness to take revenge on the world. In the 19th century, Jonathan Harker, a novice lawyer, is asked by a Romanian aristocrat to help him buy a property in London. The aristocrat, who calls himself "Count Dracula," has an eerie aura about him, but also a mysterious charm that captures people's hearts. However, Harker soon learns that Count Dracula is actually a terrifying immortal vampire. After discovering the Count's true purpose, he and his friends rise up to stop it.
