It was meant to be the seventh imperial anthology following "Shika wakashu," but it didn't come true due to the death of Emperor Nijo (1143-1165) who gave the command.
『詞花和歌集』に継ぐ第七勅撰集となるところを、下命者である二条天皇（1143－1165）の崩御に遭い実現しなかった。