ClariS (クラリス Kurarisu?) is a Japanese pop music duo and idol unit consisting of high school girls Clara and Alice from Hokkaido. Originally known as "Alice Clara", ClariS began singing covers of mainly songs featured in anime and songs originally sung by Vocaloids, and submitting them to the Nico Nico Douga video sharing website between October 2009 and June 2010. In September 2010, ClariS was signed to SME Records and released their debut single "Irony" in October 2010, which was used as the opening theme to the 2010 anime Oreimo. ClariS released six more singles between 2011 and 2013, and their debut album Birthday was released in April 2012.