When do they find out their true identity in Basara?!
Question: It's driving me NUTS!!!
(like the chapter)
this is a manga...
Answers: It's driving me NUTS!!!
(like the chapter)
this is a manga...
Heh, are you sure you want me to spoil it for you? I'll try to leave out the details then.
They find out each other's true identity in a very climactic moment within the midst of a battle. Sarasa and Shuri come face to face with one another as opposing enemies in Volume 15. It's at the very end of Chapter 54 that they see each other, but it's chapter 55 that you get their reactions to this realization.
So if you're at the beginning, you have a ways to go, but it does eventually happen.