|2002||Kazumi Akao started the conception of "Gumi-chan"
|2003||Kazumi Akao started making "Gumi-chan"
|2005||Designer, Nobuhiko Yoshimitsu joined the project on "Gumi-chan", and he changed the design of "Gumi-chan"
|2006||Photographer, Yoshihiko Tanaka joined the project, and he took the photos of "Gumi-chan" for the photo book which was published in Japanese publishing company "Maria Shobo".
|2006||Kazumi Akao held a big exhibition of "Gumi-chan, which titled "Ue wo muite aruko" at Asacom Hall which belonged to big newspaper publishing company, Asahi Shimbun Company Osaka branch. 1500 people came to see, it was the new record for Asacom Hall of Asahi Shimbun Company Osaka branch.
|2006||he doll book in Japan "Hitomi No.13" was published by Japanese publishing company "Maria Shobo". On that books, "Gumi-chan was introduced on 7pages.
|2006||At the gallery of "Aoyama book centre" in Fukuoka, the same exhibition was held.
|2007||At the gallery "14th moon" in Osaka, the same exhibition was held.
|2008||At the gallery "Gallery T" in Fujisa city, Kanagawa pref., the same exhibition was held.
|2014||The exhibition "Gumi-chan" was held at the Paul Smith shop in Albemarle street, London.
|2015||The exhibition "Gumi-chan" was held at the Sakatsu Gallery in Sugamo, Tokyo.