"GS Wonderland" is about the 1960's Group Sounds bands - A Japanese pop movement inspired by the Beatles and other mid-1960's Brit Pop. Three young men set out to start their own band "The Diamonds" when they are signed to a recording contract during their very first rehearsal. Things turn for the unexpected when their agent brings Mick (Chiaki Kuriyama) into the group as their keyboardist.

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Chiaki Kuriyama
Miku Ohno

Takuya Ishida
Masao Kigawa

Hiro Mizushima
Shun Masamiya

Yōsuke Asari
Kenta Kashiwabara

Shinji Takeda
Ryosuke Kajii (agent)

Sousuke Takaoka
Tajio Hasegawa

Mana Mikura
Taeko Ishinuki

Kendo Kobayashi
Kyoichi Kumada

Ren Osugi
Kenichi Kamata