Chie Ryūjin is the mother of the protagonist, Shougo Ryujin, in the anime Majin Bone. She holds the critical position of head researcher for cocoon technology, a key part of the bone research efforts. From a young age, Chie experienced visions of the Nepos Angelis Council launching an attack in the future, a threat she foresaw would lead to the destruction of Earth if no countermeasures were developed. These visions drove her life's work and motivated her to commit to a long-term, secretive mission to protect the planet.

Her work is so specialized that it requires her to be stationed in space for extended periods, as the cocoons she develops must be manufactured in a zero-gravity environment. This necessary absence from Earth means she is unable to have direct contact with her family, including her husband Kengo Ryujin, her daughter Tomoko Ryujin, and her son Shougo. The only family member she can communicate with is Shougo, and even then, only when he is visiting one of the research labs. Despite the physical and emotional distance, Chie has made a personal vow to return to her family once the Earth is safe from the threat she is working to neutralize.

Her role in the story is primarily defined by her sacrifice and her behind-the-scenes contributions to the war against the Nepos Council. She collaborates closely with Leonard, the leader of the bone research team, and is the subject of his studies as they work together to unlock the final form of the cocoon and master the hidden powers of the Majin Bone. While the search results provide details about her mission and family connections, no reliable information is available regarding her specific personality traits, key relationships beyond her immediate family and Leonard, her narrative development throughout the series, or any notable combat or scientific abilities she may possess.