A Fuso Army Witch that participated in the Fuso Sea Incident and Battle of Karlsland. Also known as "Fuji" and "Peregrine Falcon of the Fuso Sea". As a member of Fuso Army Air Service, Takeko participated in Fuso Sea Incident and scored two kills. Then she was reassigned to Karlsland Volunteer Flight Corps 3rd Squadron to participate in defense of Karlsland. There, she commanded the squadron and scored numerous victories.
Along with Anabuki Tomoko and Katou Keiko, she was called the "Trio of the Fuso Sea" for their victorious achievements in Fuso Sea Incident. The three were also close friends. Takeko taught Keiko how to use camera, which became Keiko's career later on. Also she is the one who suggested Tomoko to be sent to Suomus instead of Karlsland because she was worried about Tomoko.