WACK (Watanabe Artistic Creative Corporation (わたなべ あーてぃすちっく くりえいてぃぶ かぶしきがいしゃ, Watanabe Ateisuchikku Kurieiteibu Kabushikigaisha)) is a Japanese music production company specialising in alternative idols. The company was founded by Junnosuke Watanabe in 2014, following the first disbandment of Bis and the formation of Pla2me.