The Genius Four (ジーニアスフォー), or G4 for short, is the anti-phantom thief division from Yokohama. The police department established the unite to handle all Gentlemen Thieves related incidents as they continue to increase. Whilst the members don't possess any Toys, they have their respective capabilities making them the third faction in the Milky Holmes anime.
In Futari wa Milky Holmes, they were assisting other police departments with paperwork with the lack of Gentlemen Thieves incidents happening.
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