Hunter Steele and the Spider Riders persist in their intense battle against the Insectors to safeguard Arachna and save the Inner World. Standing with them are their companions, such as the astute and honor-bound Igneous, the daring Magma, and the tender-hearted Corona. Though they have successfully thwarted crises before, the respite is temporary. When reports emerge of an Insector onslaught on the Kingdom of Nuuma, the Spider Riders confront a crucial decision. While reluctant to abandon Arachna undefended, they are obligated to repay an old debt and journey across the Inner Ocean to defend Nuuma. Their mission is to locate the four keys of the Oracle held by the Insectors' leader, and establish permanent peace in the Inner World. As the final chapter of the Spider Riders series, Spider Riders: Yomigaeru Taiyou offers a grand culmination. The fate of the Inner World is in Hunter and his companions' hands. Will they retrieve the Oracle Keys successfully, or will Mantid and the Insectors finally realize their dream to seize control of the Inner World?