Yokohama, 1963. Japan is picking itself up from the devastation of World War II and preparing to host the 1964 Olympics—and the mood is one of both optimism and conflict as the young generation struggles to throw off the shackles of a troubled past. Against this backdrop of hope and change, a friendship begins to blossom between high school students Umi and Shun—but a buried secret from their past emerges to cast a shadow on the future and pull them apart.
Hoping to catch a girl's attention, high school students Ken and Adama cook up an ambitious plan. They plan a festival that combines film, theater, and rock music, and develop their project into a school road block. This plan however catches the attention of television stations and newspapers, and soon even the cops became involved in this teenage adventure.
"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.
In this retelling of an infamous unsolved heist, a couple tries to outlast the statute of limitations after successfully stealing 300 million yen.