Eriko Hori , better known by her stage name Pile, is a Japanese singer, actress and voice actress from Tokyo. Her first roles were minor parts in TV series and films during 2006. She debuted as a singer after she was selected in a 2006 Japan-wide audition and she made her voice acting debut in the Love Live! School Idol Project series in 2010.

Love Live! School Idol Project is a Japanese multimedia project co-developed by ASCII Media Works' Dengeki G's Magazine, music label Lantis, and animation studio Sunrise. It is the first multimedia project in the Love Live! franchise. The project revolves around a group of nine schoolgirls who become idols in order to save their school from shutting down. It launched in the August 2010 issue of Dengeki G's Magazine, and went on to produce music CDs, anime music videos, two manga adaptations, and video games.