*btw this is all very smart theories by me from what i think will happen* Ok so the thing that happened 10 years? it gotta be the secret of Sakuya and why they sometimes talk about her as if she is not just a human... i guess they put some biometric thingy in her that allowed her to be now a hybrid? i mean she said she never got sick before @_@ and i also realized now that in the ending of route B... in the future i guess Ishtra will lose her life and give her account info to Sakuya? that's why she can log in the account... but she is using it as a shadow... so i think it's thanks to her special nature?