Eiko Shimamiya (島みや えい子, Shimamiya Eiko, born April 20), also called Eiko or Peko, is a female j-pop singer-songwriter, lyricist, and composer. Born in Chitose, Hokkaidō, she lives in Sapporo. She was the vocalist of the music production group I've Sound from 1999 to 2011, but now she is currently active as a freelancer. Blood type is A. Her old name was 島宮 えい子 (reading is the same). She is best known for singing the opening themes of the anime series When They Cry (Higurashi no Naku Koro ni).