|Kanji Name||斉藤 八雲|
|Romaji Name||Saitou Yakumo|
|Occupation||2nd Year Student|
|Relatives||Isshin Uncle (Deceased)
|Manga Debut||Chapter 1|
|Anime Debut||The Forbidden Room|
Yakumo Saitou (斉藤 八雲 Saitou Yakumo), the main protagonist, is an 20-21 year old college student, who lives at the filming club room in school. He was born with heterochromia iridis, a difference in eye color, the color of the left one is crimson red. This eye, which he usually hides behind a contact lens, gives him the ability to see ghosts and spirits and has brought him many hardships throughout his life.
He has dark brown hair, that is styled in a messy manner with his right eye matching it. His left eye is red with a slitted pupil covered by a contact lense. He typically wears a white shirt with blue jeans.
Yakumo is blunt, sarcastic, and often comes off as cold or condescending. He acts like a stranger and is not good with other people. He also does not care about what others think. However, he has a kind heart and will help whomever comes to ask him for help. He often uses tricks and traps to gain what he wants; for example, he tricked a teacher, whose classes Yakumo often skipped, in to believing that he was cursed with a supernatural affliction and in payment for 'exorcism', full class credits. He often teases Gotou and Haruka about their relationships and intelligence. He has a surprisingly strong sweet tooth, as he often eats parfaits. Yakumo is also very ticklish; he automatically crashes in to the nearest wall from shock when somebody (namely Haruka) pokes him in the side.
Yakumo is shown to be highly intelligent, observant, and logical, often solving mysteries before the police. Yakumo is sensitive about only being able to see and speak to spirits and not being to exorcise them. He often feels helpless at his own powerlessness. Yakumo is exceptionally guarded with his feelings and is close to very few people: Haruka, Gotou, his uncle Isshin, and his younger cousin Nao; whom he treats with exceptional kindness and gentleness. He will go at great lengths for these people and risk his life to save them. Many think that Yakumo changed a little after meeting Haruka and appears to have developed feelings for her.
When Yakumo was born, his mother was terrified after spotting his red eye. To her, Yakumo was nothing but an unwanted child. She even attempted to strangle him one day, when he still was a child, though a nearby policeman prevented his death and made her flee the scene. After that incident, his mother went missing and she hasn't been found even ten years later. It later turns out that Yakumo's mother did not hate his eye and only tried to kill him to prevent him from becoming evil like his father.
His uncle was the one who named him Yakumo. Yakumo means 'many layered clouds'. Isshin gave him this name, while believing that someday his heart would be clear as blue sky, and he would see the world without sadness or anger.