They always steal the prey they aim for. That is Phantom Thief Queen. Gender, age, nationality unknown. Together with their partner Joker, RD, they travel around the world on the airship Troubadour. This time, the Queen is aiming for a cursed jewel, the legendary Rose of Linden. A hypnotist, an acrobat, a magician...the talented circus members challenge the Queen! What is their purpose? In order to get back the jewel, the Queen stands up to the challenge in a bold and brilliant way (or disguise). Nothing is impossible for the Queen!<br>
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(Source: HIDIVE)

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A detective previously a professor of a college, has moved to the house next to Ai Iwasaki's. He's a reader who likes to read to the extent that he forgot to eat for three days, forgetting his birthdatesand even forgetting the cases he has solved. He saw that there are three sisters (Ai, Mai, and Mii) in Iwasaki's house! 

Mii Iwasaki