The Hokkaido-based trio formed in 2010 originally named the group, "phatmans after school". Since then, the band gained fans from the young generation regardless of gender. With the band renamed to "saji" in 2019, their new single "Tsubasa" was selected as the outro theme to TV anime "Ahiru no Sora. Limited Edition comes with two tracks. DVD comes with a music video of "Tsubasa," its another version and a documentary on the recording.