A middle-aged Occult Detective and documentarian, Kobayashi investigates supernatural mysteries with his cameraman Miyajmima. He is a loving husband to his wife Keiko, but is driven by a need to learn the truth behind his cases, no matter how scary it is. A number of unrelated cases all weave together, putting Kobayashi on a path that ultimately leads to his disappearance, as stated in the film's prologue.
- Adult Fear: Searches frantically for Kana when she goes missing. He can do little when Hori comes calling, attacking Junko's son with the intention on killing him. Even more so when the possessed Hori brains him with a rock, and Keiko sets herself on fire.
- Always Save the Girl: Spends most of the film trying to save Kana and Marika from Kagutaba.
- Audience Surrogate: Shared with Miyajima, Kobayashi guides the viewers through the mystery and is often scared and spooked on their behalf.
- Be Careful What You Wish For: Kobayashi's motto is that he wants to know the truth, no matter how scary. His latest (and last) case leads him dark a terrifying path of demons, possession, ancient evil, animal mutilation, and cannibalism, and everyone connected to it either dies, disappears, or suffers greatly.
- Cruel and Unusual Death: Keiko is possessed by Kagutaba and sets herself on fire.
- Determinator: Though soft-spoken, kind, and patient, Kobayashi is relentless in his pursuit of the supernatural.
- Don't Go Into the Woods: Goes into the woods where Shimokage used to stand, coming across the old Kagutaba shrine. It's all downhill from there.
- Fat Best Friend: To Miyajima.
- Friend to All Living Things: Very kind and courteous to everyone from children, to weird shut-ins, to mental patients. However, his kindness has limits, breaking into Junko's house in the third act and defends his family from a crazed Hori.
- In-Universe Camera: Takes on the role of a cameraman during the third act.
- Never Found the Body: Kobayashi is reported to have disappeared at the start of the film, and remains missing by the end. May or may not still be alive judging by the video camera sent to his office in his name following his disappearance.
- Occult Detective: Runs a investigation company based in paranormal cases, which appears to be quite stable. Despite looking and dressing like a forty-year old librarian, Kobayashi is an observant, thorough, and skilled detective. He specialises in ghost encounters primarily and supernatural phenomena.
- Papa Wolf: To Kana and Junko's unnamed son.
- Paranormal Investigation: His profession and the focus of his documentaries.
- Parental Substitute: For Junko's son. That doesn't go so well.
- The Stoic: Remains mostly calm and composed around spooky things, but will naturally be frightened if things become too terrifying.
- Woman On Fire: Keiko's death.
Kobayashi's friend and cameraman.
- Audience Surrogate: Serves as the eyes of the audience throughout the film, a majority of the movie shown through his camera.
- Camera Abuse: Miyajima is quite stable with his camera, even when the characters are traversing the scariest moments of the movie. It glitches for the first time when Hori freaks out upon asking what Kagutaba is, creating an Ominous Visual Glitch showing a collection of Kagutaba masks.
- Flat Character: We never really get to know Miyajima as a person since he is offscreen most of the time.
- In-Universe Camera: Kobayashi's cameraman.
- Small Role, Big Impact: Subverted, since he is the film's cameraman and main point of view.
- The Voice: Rarely makes a physical appearance, since he is carrying the camera, and we only hear him make the occasional comment. Even when he is on screen, we never actually see his face since it is just out of shot.
[[Creator/Marika Matsumoto Marika Matsumoto
A television actress who encounters Kagutaba during a broadcasted ghost hunt, Marika calls upon Kobayashi for help when she begins sleepwaking and performing strange things at night.
- Break the Cutie: Marika is a sweet-natured and kind woman, but her involvement with Kagutaba causes problems for her in the haunting department.
- Damsel in Distress: Periodically possessed by Kagutaba. Never physically in danger, nor does she get kidnapped, but her on-and-off possession turns her life upside-down.
- Demonic Possession: A non-standard example. Marika isn't directly possessed by Kagutaba, but influenced by him, having a couple of psychic attacks, sleepwalks to fashion herself nooses, and occasionally lets out a demonic groan. Also attracts suicidal pigeons. It turns out that Kagutaba may either be trying to use her as medium, or to be a sacrifice in his resurrection. Kobayashi helps her be free of Kabutaga's influence by completing the pacifying ritual. She is attacked one more time when Kobayashi and Hori stumble across the shrine, but is freed for good.
- Psychic Radar: Marika can sense ghosts and the presence of others, but a ghost hunt near Kagutaba's shrine attracts the demon's attention.
- Sleepwalking: Marika begins to sleepwalk after her initial haunting, finding herself drawing weird imagery and crafting looped nooses from yarn and wires. They are later revealed to be related to Kagutaba and invoked by suicidal worshippers to pay tribute to him. This includes Marika's neighbour Midori.