Not much is known about Haruitsuki's past but at the age of 7, Haruitsuki was taken in as an employee at the Mononokean by the previous master, Aoi. Around that time, Haruitsuki met Yahiko in a forest as Haruitsuki had gotten lost. He ended up playing hide and seek with Yahiko for three days. After an unknown time, Haruitsuki was made the new master of the Mononokean by Rippō.
In Chapter 3, Haruitsuki was reluctant to give Big Boss Scree a medicine that could potentially save him from a parasite shrub at the risk of his own life. This is referenced again in Chapter 11 where Rippō mentions Haruitsuki doesn't have to worry about a parasite shrub infecting a human. In addition, there are rumors stated in Chapter 10 that Haruitsuki killed the previous master of the Mononokean, Aoi, to usurp his position and this is again referenced in Chapter 16 by Yahiko, though Haruitsuki states that he never wanted Aoi to die. There is a possibility Aoi was infected by a parasite shrub and died after taking the medicine Haruitsuki gave him that he also gave to big Boss Scree to try and save him from the parasites.
- Main Article: The Beginning
Big Boss Scree Exorcism
Introduction of Zenko Fujiwara
Introduction of Yahiko
Princess Anmo and Jomatsu Exorcism
- Main Article: The Marked Difference