ecosystem (エコシステム) is a Japanese band formed in Osaka. Their music blends alternative rock and progressive rock, and their songs are shaped by everyday lyrics and unusual arrangements. The group released the mini album Jean in 2010 and continued building their profile as an indie band before their major-label debut. They went major with the single Dilemma in November 2011, which also served as the opening theme for the anime Gintama.
