Ichitarō Ushiro, a high school student born with latent psychic abilities, was forged by his upbringing in a family entrenched in paranormal research. His father, Kentaro Ushiro, employed at a paranormal institute, immersed Ichitarō in supernatural phenomena early, nurturing a keen sensitivity to spiritual forces long before he could command them.

When a classroom Kokkuri-san (ouija board) session escalates into chaos, Ichitarō’s attempt to convince skeptic teacher Kobayakawa of psychic existence backfires, summoning a fox spirit that possesses the teacher. The ensuing violence is halted only by Hyakutaro—a guardian spirit bound to Ichitarō—who materializes from behind him to subdue the threat, cementing their symbiotic connection.

Later, during a poltergeist investigation with his father, Ichitarō falls prey to a malevolent possession. Hyakutaro’s absence forces exorcist Funakoshi to intervene, leaving Ichitarō shattered. Determined to strengthen his bond with Hyakutaro, he turns to a mystic’s counsel, pledging to live virtuously and pray fervently to his guardian.

His devotion unlocks a visionary journey through the afterlife, guided by Emanuel Swedenborg’s teachings. This revelation transforms Ichitarō’s perspective: once locked in battles against hostile spirits, he now navigates a quest for metaphysical equilibrium. His evolution—from dependence on external protection to disciplined spiritual agency—underscores his resolve to uphold moral integrity, ensuring his pact with Hyakutaro endures.