Thirteen-year-old Akinori Arihoshi, born into a centuries-old shaman lineage, masters ancestral arts of yo-kai divination and spiritual rites. Inheriting his family’s generational prowess, he perceives and commands yo-kai unaided by mechanical devices—a rare gift setting him apart. Based in Springdale, he collaborates with Natsume Amano and Touma Tsukinami at the Shadowside Detective Agency, operating from his ancestral home. Schooled in archaic incantations, he wields protective magic to counter threats like oni-transformed humans. His grandmother Mitsue equips him with a spectral radar to pinpoint the elusive yo-kai watch, cementing his role in supernatural conflicts. Though initially watchless, he later obtains the yo-kai watch Animus (or Animas), channeling celestial spirits to bolster the team’s arsenal. A tactical mind steeped in yo-kai mythology guides the group through paranormal crises, while his customized computer systems map spirit activity and orchestrate covert operations. Despite a reserved nature, he forges unshakable bonds with Natsume and Touma as they confront adversaries like the Oni King and Rasen, striving to stabilize human and spirit realms. Familial records allude to undocumented siblings, yet his growth remains focal—transitioning from solitary apprentice to a pivotal ally who merges ancient rituals with modern innovation. This evolution reflects his balanced embrace of tools like the yo-kai watch while upholding his lineage’s sacred legacy.