Kuroo is the head of one of the Mafias in city, which there are Kenma, Yaku, Liev and Koshi Sugawara. Bokuto is the head of another Mafia in which he has Akaashi, Oikawa Tooru and Takahiro Hanamaki. One of the most dangerous is the one from Wakatoshi, he has has Eita Semi, Satori Tendo and Matsukawa Issei and Iwaizumi Hajime

Daichi Sawamura is a policeman, and you and Hinata Shoyo end up in Kuroo's mafia because Noya and Asahi catch you two

Kuroo: Hmm...? Who is this?