Yui Sakakibara (榊原ゆい Sakakibara Yui?, born October 13 in Hyōgo Prefecture) is a Japanese voice actress, choreographer, dancer and singer. She appeared on Kōhaku Uta Gassen as back ground dancer behind Ami Suzuki in 1999 and 2000. She used to use the name Mayo Hinano (雛野 真代(まよ) Hinano Mayo?) and others in her previous voices. She is also credited as FES from 'Phantasm' (ファンタズム?) band in Chaos;Head and Steins;Gate (FES is a stage name of her character Ayase Kishimoto from Chaos;Head).