Setsuna Yuki is an enigmatic, legendary school idol. Unlike her fellow members of the Nijigasaki School Idol Club, Setsuna initiated her school idol career on her own accord, and she follows it very seriously. Many other students of Nijigasaki claim to have never seen Setsuna at school due to the fact that she takes school idol activities extremely seriously. Despite her mysterious aura, Setsuna is a very studious girl, who devotes all of her off time to her classes and studies. Setsuna is also very friendly, and would do anything to support those she cares for. Setsuna's voice has the most power in her mid to low tones, is extremely bold, and is a bit raspy.