Ranko Takara leads the Shin-Takarazuka Academy Cosplay Club, reigning World Series champions. She wields exceptional cosplay talent, capable of physically modifying her own body and others' for precise character replication and infusing performances with distinct personalities.

As mentor and boss to club member Tsukasa Tomii, Ranko pushes her assistant hard to conquer shyness and compete, driven by belief in Tsukasa's latent talent. She commands the club's activities and upholds its competitive dominance.

Ranko stands as the primary rival to the East Oizumi Academy Cosplay Club, specifically challenging Chako Hasegawa. Their rivalry peaks in a formal cosplay battle within East Oizumi's gymnasium, where Ranko directly faces Chako. During the sudden-death round, Ranko embodies Queen Serenity from *Sailor Moon*, opposing Chako's Princess Serenity.

She maintains a relationship with her boyfriend, Kazuke. An unresolved element involves a mysterious blue-haired woman seen driving the Shin-Takarazuka club's limousine in the final episode; any direct connection to Ranko or its implications remains unexplored.