Archer Bisco Akaboshi, cleared of the false "Mushroom Criminal" charge that once had every hunter in Japan chasing him, keeps searching a rust-ravaged wasteland for the Sabikui, the mythical mushroom said to reverse the Rusty Wind's corrosion. Doctor Milo Nekoyanagi and swordswoman Pawoo Nekoyanagi travel with him, and their search picks up where the first season left off.