Jyouganki belongs to The Third, an organization marked by red jewel-like "Space Eyes" on their foreheads that enable data access and communication. He oversees and protects humanity's remnants on a post-apocalyptic Earth, enforcing the "technos taboo" technology restrictions while wielding significant political influence within The Third's hierarchy.

He maintains persistent surveillance over Honoka, a human girl with an anomalous blue third eye mutation, monitoring her activities due to her unique status. His recurring interactions with Honoka form a narrative cornerstone.

Later captured by Rona Fauna and imprisoned, this event drastically alters his trajectory, though the circumstances of his capture and ultimate fate remain undisclosed.

Physically, Jyouganki appears as an adult male with gray eyes, waist-length gray hair, and pointed elf-like ears. He is frequently depicted wearing a cape and bears a distinct facial mark.