Sachi Tainaka(タイナカ彩智,Tainaka Sachi?, born April 30, 1986) is a Japanesesinger who is best known for her vocals in the opening songs of the anime version of Fate/stay night. She has a 3½-octave vocal range.
Although her name was written in katakana, her birth name is written in kanji. However, as of December 2010, she chose to write her first name in Kanji.
Sachi admitted that Aitai yo. is actually a song that she wrote to express her feelings when she had to leave the person she loved during the summer of 2006. She also admits that her lyrics was soaked with tears by the time she was finished writing them, and that the greatest thing about singers is that they can express their true feelings honestly through melody and voice.