Spawned from anime series Guilty Crown, EGOIST is a group produced by ryo of supercell. Songbird chelly takes the vocal, selected from over 2,000 applicants. All of their CDs have ranked within 10th in Oricon weekly chart, which has made an unbroken record.
I haven't listened to this song in almost a decade, it got back to me after sooooo long and even if I didn't remember it right away, I still recognized it as something I knew!