Kogarashi Fuyuzora's childhood was marked by supernatural affliction, his body attracting ghostly possessions that caused social isolation and forced frequent moves between facilities. A critical incident at age nine involved a ghost dog possessing him to attack his caretaker, Sakura. Later, Sakura's father used his body for stock trading, triggering a market crash that saddled Sakura with 10 billion yen in debt. This tragedy drove Kogarashi to flee, vowing to repay the debt and harboring deep resentment toward spirits.

During his subsequent homelessness, countless ghosts possessed him, unintentionally transferring diverse skills and expertise—martial arts, cooking, sports, artistic talents—that enabled his survival. A significant possession involved Ouga Makyouin, descendant of the Yatahagane clan and master exorcist. Under Ouga's tutelage, Kogarashi trained rigorously, eventually inheriting the mantle of the 7th Yatahagane, a title signifying immense spiritual authority. His path led him to Yuragi Inn, a budget boarding house rumored haunted, where he planned to earn free lodging by exorcising its resident ghost.

Kogarashi presents a stereotypical delinquent appearance: messy brown hair often tied in a small ponytail, honey-colored eyes, and bandages wrapping his forearms and lower legs. He wears a magatama necklace, a relic from his training. This rugged exterior sharply contrasts his calm, kind demeanor and strong moral principles. He avoids violence unless necessary and strictly adheres to a vow against harming women, a tenet complicating his initial exorcism of Yuuna Yunohana, the ghost haunting Yuragi Inn.

His core motivation is attaining a normal life, making him cherish mundane experiences frequently disrupted by supernatural interference. He becomes easily flustered in intimate situations and suppresses erotic urges despite frequent accidental encounters with female residents, often triggered by Yuuna's sleep habits or others' actions. He rejects casual relationships, insisting mutual love is prerequisite to physical intimacy.

At Yuragi Inn, Kogarashi's life intertwines with its eclectic residents. Discovering Yuuna was harmless, he shifted focus from exorcism to resolving her lingering regrets to prevent her descent into evil. Their shared experiences fostered mutual romantic feelings, culminating in marriage and co-management of the inn. His relationships extend to others: Sagiri Ameno, a ninja evolving from hostility to love confession; Hibari Ameno, who pursues him despite initial rejection; Oboro Shintou, a tengu seeking genetically strong offspring who later develops genuine affection; and Nonko Arahabaki, a fellow powerhouse from one of the Three Big Families who frequently involves him in risqué situations.

Kogarashi wields formidable spiritual abilities. As a spirit medium, he channels ghosts to access their diverse skills, from combat to culinary arts. Inheriting the Yatahagane mantle expanded his powers to include planet-level destructive force, enhanced durability, and sub-relativistic speed. His signature technique involves Yuuna possessing him to merge their spiritual energy, manifesting battle armor and amplifying their abilities.

Key plot developments test his resolve. He intervenes in conflicts like the Sekigahara battle between yokai factions, halting combat with displays of raw power that crater the ground. During the final arc, his body is usurped by Nonko's father, leading to spiritual disintegration. His soul is restored through a ritual fueled by the affection of his harem, showcasing their deep bonds. In all envisioned futures, his survival hinges on Yuuna's presence; her passing would leave him emotionally shattered. The series concludes with Kogarashi marrying Yuuna and solidifying their life together at Yuragi Inn.