Wakkyanai (Z) わっきゃない(Z) 4th single by ℃-ute , Umeda Erika , Yajima Maimi , Murakami Megumi , Arihara Kanna , Nakajima Saki , Suzuki Airi , Okai Chisato , Hagiwara Mai Released July 29, 2006 Editions 1 Regular edition · Regular TGCS-3512 · ¥800 · July 29, 2006 1 Wakkyanai (Z) A-side 2 Wakkyanai (Z) (Instrumental) Participants Umeda ErikaYajima MaimiMurakami MegumiArihara KannaNakajima SakiSuzuki AiriOkai ChisatoHagiwara Mai
