"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.
| Directing | Ryūichi Honda | Director |
| Writing | Ryūichi Honda | Screenplay |
| Writing | Yuji Nagamori | Screenplay |
| Camera | Gen Kobayashi | Director of Photography |
| Art | Tomoyuki Maruo | Production Design |
| Sound | Sally Kubota | Music |
