Crk x my au cap1:The arrival of new witches (cap 1 English version)

Furina is Shadow Milk's sister And they both have two younger sisters (White and Luna) But one day something terrible happened: a portal opened to an unknown universe called X-Way((Not a very smart name, I know) Okay The portal absorbed the two little girls, taking them to that unknown universe And the portal closed before any of the older ones could save their little sisters But four years later (White and Luna are 8 years old and Shadow Milk and Furina are 555 years old in my AU)The witches and their mother brought cristal The girls' tutor paving the way for the girls to reunite with their mother