Rinka Aiba is one of the main heroines of Yuri Tama: From Third Wheel to Trifecta. She is Yuna Momose's best friend since childhood. Both of them fall in love with Yotsuba Hazama. While Yuna acted competing with Rinka for Yotsuba's love and affection, Rinka was actually happy that Yotsuba was dating Yuna, and agreed to let Yotsuba date both of them. Rinka is the second to confess, and thus, she is Yotsuba's second girlfriend.