In this world, creatures like vampires and werewolves still roam, but Aya Rindo can't say the same for herself. This beautiful disembodied head, carried by her maid Shizuku Hasei, is a detective in search of her stolen body. One evening, they encounter half-human Oni Slayer Tsugaru Shunichi, who offers a helping hand. Now, the trio is traveling through Europe, solving mysteries along the way.
