A vampire bound by blood contract to a woman hunting immortality through a supernatural MacGuffin sounds generic until you realize the actual show is two people constantly bickering while stumbling through 1920s monster encounters that treat action and slapstick with the same energy. Mosquiton's eternal misery at being enslaved to someone who barely knows what she's doing is the entire joke. Six episodes moves fast enough that you never stop to ask if the O-Part actually matters.

In the 1920s, Inaho brings a vampire called Mosquiton back to life by giving him her blood. Once awake, he becomes her servant. Inaho is searching for the O-Part, an object said to make its holder immortal, but a crowd of supernatural monsters is determined to keep the pair from reaching it. Across six OVA episodes, the story mixes action, adventure and comedy with its supernatural premise.