Mitsui (ブラックブッククラブ) was a member of the Black Black Club.
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Spirit Detective Saga[]
Mitsui and the rest of the Black Black Club were present via video chat at Gonzo Tarukane's mansion placing bets on Yusuke's and Kuwabara's chance of survival. He among others were shocked at Sakyo's gambling and left abruptly after Tarukane lost his fortune.
Dark Tournament Saga[]
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| e v | Black Black Club | |
| Members: | Gonzo Tarukane | Butajiri | Sukezo Gondawara | Fukawa | Mitsui | Sakyo | The bald bearded member | The bespectacled member | |