The beloved puppet show "Zawazawa Forest's Ganko-chan" makes its first anime series appearance to commemorate its 20th anniversary! In the distant future, after humanity has gone extinct, a human boy named Gen-kun travels via time machine from the year 2020 to Zawazawa Forest on Earth. Gen-kun ends up staying at Ganko's house, but in Zawazawa Forest, there is no electricity, running water, or gas—things that were commonplace in Gen's time. There's no TV, smartphones, convenience stores, no snack foods, and no video games. So, how on earth will Gen-kun manage to live here...?! The fun and chaotic adventures with the friends of Zawazawa Forest begin!