SF-A2 miki is a Japanese VOCALOID2 voicebank developed by AH-Software, released on December 4, 2009, alongside Hiyama Kiyoteru and Kaai Yuki. Voiced by Miki Furukawa, she is depicted as a 15-year-old girl with a design featuring a development code 'SF-A2'. Updated to VOCALOID4 in 2015 and Synthesizer V2 AI in 2025. Known for excellent treble handling but weaker low notes and pronunciation. Often paired with Hiyama Kiyoteru in teacher-student dynamics with Kaai Yuki.