°C-ute is Hello! Project group consisting of the seven Hello! Project Kids who are not in Berryz Koubou, as well as Arihara Kanna, a Hello! Project Egg. The group was officially announced by Tsunku on his website on June 11th 2005, although the information had already been leaked some time earlier. °C-ute appeared in several concerts performing an original song "Wakkyanai (Z)". Arihara was added and made her debut in January 2006 at the start of the Hello! Project Winter 2006 tour, as part of the Wonderful Hearts team.