A fire claims the life of a young boy's mother, leaving Hikari orphaned and stripped of his memories of the accident. Yojin, the investigator assigned to the case, takes Hikari into his home for reasons that are not immediately explained. Their daily life together is an awkward adjustment, with Yojin struggling to bridge the emotional distance between them while Hikari tries to adapt to a new normal. That fragile peace is shattered whenever otherworldly creatures cross into their world, forcing Yojin to reveal his true role as an exorcist who wields a unique umbrella-like weapon. The monsters, which bear a strong resemblance to yokai, attack with relentless purpose, and Hikari soon finds himself drawn into the hidden realm that exists between the mundane and the mysterious. As the two learn to trust each other, deeper questions surface about the fire that killed Hikari's mother, the shadowy organization Yojin works for, and the strange connection that seems to link Hikari to the supernatural threats they face. The story unfolds as a stylish action series built on a growing found-family bond, with each encounter peeling back another layer of a larger, unresolved mystery.