Ranka appears as a minor character in SSSS.Dynazenon, belonging to Yomogi Asanaka's circle of friends at Fujiyokidai High School. She is depicted as a friend within this group. Her physical appearance includes a distinctive red backpack, visually highlighted in scenes such as its placement beside Nazumi's black backpack. In episode 12, Nazumi places a hand on Ranka's shoulder to calm her during a tense moment, indicating a supportive dynamic between them. This interaction represents one of the few explicit references to her interpersonal relationships. Ranka's involvement remains confined to brief appearances as part of the ensemble cast across the Gridman Universe, including seasons, movies, OVAs, and spin-offs, without substantial background story, personal conflicts, character evolution, or contribution to major plotlines or thematic arcs.