Egoist's debut single 'Departures (Anata ni Okuru Ai no Uta)' ( Departures －あなたにおくるアイの歌－, Departures －Anata ni Okuru Ai no Uta－, 'Departures (The Love Song for You)) was released on Novemthe song was used as Guilty Crown 's first ending theme. Out of about 2,000 candidates, then 17-year-old female singer Chelly was chosen to sing under the persona of the band's vocalist Inori Yuzuriha. That year, Supercell held auditions from May 25 to June 19 for the vocalist on the band's third studio album Zigaexperientia (2013), and Ryo was also searching for the vocalist of Egoist, a fictional band featured in Guilty Crown. In 2011, Ryo of Supercell was tasked with composing theme music for the anime television series Guilty Crown.

Egoist's debut album Extra terrestrial Biological Entities was released in September 2012.

Originally formed to produce theme music for the 2011 anime television series Guilty Crown, the group continued creating other songs after the end of the series including themes for other anime television series including Psycho-Pass and Kabaneri of the Iron Fortress. Egoist is a Japanese pop music duo consisting of songwriter Ryo of Supercell and vocalist Chelly.

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