Houryusei serves as the assistant to the chief of song officers. He is a man of apparent age around thirty years, distinguished by a prominent scar on his face. His physical appearance includes spiky brown hair cut to ear length and yellow eyes. He is depicted wearing a headband, boots, and a coat, contributing to a practical and battle-ready image.

Background wise, Houryusei was formerly an earthly Xian, a being of significant spiritual status. However, three years prior to the events of the story, he chose to return this immortal status and now lives as a human being. This background as a former Xian underlies his deep understanding of the world's mystical mechanisms. His personality is marked by a distinct lack of ambition for career advancement or political power. Despite his high-ranking position as assistant to the chief, he has no personal interest in climbing the bureaucratic ladder. Instead, he is quietly dedicated to his duties, possessing outstanding skills that are not limited to combat. Notably, he has an exceptional talent for making sweets, an ability that contrasts with his stern appearance and offers a glimpse into a more domestic and restrained side of his nature. He is also recognized as a trainer of exceptional skill, indicating that he plays a key role in honing the abilities of other song officers.

Houryusei's primary motivation does not stem from personal glory but from responsibility. He was not chosen as the assistant to the chief of song officers because he desired the role, but because he is identified as the only person capable of controlling Sonto. This unique qualification forces him into a position of great authority and burden, making the maintenance of order and the management of powerful, uncontrollable forces his central mission.

In the narrative, his role is that of a key supporter and advisor. He is positioned as the right-hand man to the chief of song officers, acting as a stabilizing force within the organization. His judgment is trusted, as seen when Ichiyou follows his counsel during a critical moment of injury, allowing him to choose which servant god to summon based on Houryusei's tactical advice. Regarding key relationships, his most significant bond is his role as the controller and handler of Sonto, a figure likely possessing a difficult or volatile temperament. He also has a direct partnership with his subordinate god, the Princess Flower of the Ten Immortals, whom he can summon in battle. His interactions with younger characters like Ichiyou also highlight his role as a mentor and strategist.

Houryusei's development is subtle but rooted in his loss of status. Having deliberately stepped down from being a Xian to live as a human, his journey deals with the consequences of that choice and the irony of gaining immense power and responsibility only after renouncing his former divine nature. His abilities are formidable. He possesses superb combat and training techniques, a legacy of his time as a Xian. His tactical acumen is sharp, allowing him to assess dangerous situations and provide life-saving instructions to others. Combined with his unique capacity to restrain and control the powerful Sonto, Houryusei is characterized not by overwhelming offensive strength, but by control, precision, and indispensable skill.