In the ongoing battle against the Insectors threatening the Inner World, Hunter Steele and the Spider Riders valiantly defend Arachna, aided by his companions Igneous, a clever royal officer, Magma, a daring warrior, and Corona, a compassionate girl. Despite averting a crisis, a new threat emerges as the Insectors target the Kingdom of Nuuma. Reluctant to leave Arachna vulnerable, the Spider Riders embark on a perilous journey across the Inner Ocean to aid Nuuma, guided by the need to honor past debts. Tasked with retrieving four keys from the Insectors' leader, Hunter and his allies strive to secure peace in the realm. As the thrilling conclusion to the Spider Riders saga unfolds in Spider Riders: Yomigaeru Taiyou, the fate of the Inner World hangs in the balance. Will Hunter and the Spider Riders succeed in obtaining the Oracle's keys and thwart Mantid's ambitions, or will the Insectors triumph in their quest to conquer the realm?