The Super Secret Number Card Investigation Club, S.S.N.I.C. or simply known as Numbers Club (ナンバーズ·クラブ, Nanbāzu Kurabu) in the manga and Japanese version, is a club formed by Yuma Tsukumo's friends. In reference to its name, the club is established with the purpose of uncovering the mystery surrounding the "Number" cards without Yuma's help.