OK, just to make sure my dim-witted brain figured this out correctly, when SOMEONE yelled "Father!" that means that Shiori is back as a separate person?  I would've preferred to have that be a bit more explicit so I could be sure it wasn't Ono saying it referring to his father-in-law? 
Did the author do this just to avoid having to decide how Shiori would be dressed and where she would be when she reappeared?