Ep. 4: Milo and Bisco journey to Touhoku to find the Rust-Eater mushroom and reunite with Actagawa.
Aired on February 1, 2022

Milo and Bisco travel to Touhoku seeking the legendary Rust-Eater mushroom. They reunite with their friend, the giant crab Actagawa. Milo struggles with training to ride the crab but succeeds in communicating with it through kindness. That night, they attempt to rest at the Nikkou War Memorial. There, they encounter a jellyfish girl they previously met in Imihama. The journey continues as they navigate these unexpected encounters while pursuing their goal. The reunion with Actagawa marks a significant step in Milo's development, allowing him to connect with the creature despite initial difficulties in mastering the riding techniques required for their quest.
Episodes
- Ep. 1 · A lone priest with an unusual bow arrives in a rusted wasteland while a doctor seeks a cure for his sister.
- Ep. 2 · Wanted criminal Akaboshi Bisco creates chaos in Imihama with giant mushrooms while seeking medicine for his mentor Jabi.
- Ep. 3 · Bisco and Jabi seek the Rust-Eater mushroom in Touhoku while Kurokawa hunts Bisco
- Ep. 4 · Milo and Bisco journey to Touhoku to find the Rust-Eater mushroom and reunite with Actagawa.
- Ep. 5 · Bisco and Milo encounter a town of children threatened by Flying Blowfish near Calbero.
- Ep. 6 · Bisco and Milo rescue Tirol in Shimobuki Prefecture while traveling to Konakidani
- Ep. 7 · Bisco and Milo face the two-headed Pipe Snake while Pawoo arrives and Kurokawa approaches
- Ep. 8 · Kurokawa's ambush leaves Bisco injured while Milo pursues captives into a deadly trap