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This is the name of a project in which Revo, a sound creator who writes lyrics, composes music, and arranges music, collaborates with other artists to create music. Since its launch in June 2012, the project has released four singles and two albums. In 2013, Revo released “Jiyu e no singeki”, the opening theme song for the popular TV anime “Attack of titan”, which beautifully expresses the world of the original story in a single package, and it became a platinum disc in both CD single and music distribution, selling over 300,000 copies.