you were their sister. When your parents were killed, you were sent to an orphanage, but no one knew that you had two brothers, since they made it so that everyone perceived them as one person. And you knew a lot about the secret.

And then one day you were taken into the family. Now you have three, but your parents thought there was a whole room for two. They called themselves 'Hitori', although they themselves were Migi and Dali