"Friendship" and the soul of the Butei are put to the test――! Encountering unprecedented supernatural phenomena on the island of Ayakashi!? Suddenly appearing before Akari is a fox spirit girl named Fumiake. What she presents is a "request letter" from the Ayakashi who can no longer catch fish on Meii Island! What unimaginable horrors and formidable enemies await the Amika Group on this isolated island in the middle of the ocean――!?