A member of "Genius 4". The leader of Genius 4 (known as G4 for short), a police investigation unit. She is a bossy girl who looks down on Milky Holmes since they lost their Toys and always claims to boast a massive IQ. She smacks Sherlock with a golden mask whenever she calls her "Kokoro-chan". She's named after Akechi Kogoro, the most famous Japanese detective character and adoptive father and mentor of Yoshio Kobayashi.

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