Explanation: So Sakura has an angelic side named Saruki, and Sayuri has a corrupted side named Sayuka. Sakura can either transform into Saruki, or Saruki can become her own person when Sakura lets her. For Sayuri it's the same thing, but Sayuka rarely goes into her own form without making Sayuri transform. Saruki and Sayuka are also "twins" but Sayuka was created by a powerful demon who worked with a powerful angel, and then Saruki was created. They're still acknowledged as twins though. Sayuka also hates Saruki for being too optimistic.
