What quest do i need to finish to enter echigo state premise

[oniHIME]

What quest do i need to finish to enter echigo state premises?

[Firon]

What quest do i need to finish to enter echigo state premises?

Depends where you're up to :P

If you're at Echigo I think you just need to finish a quest in Onigashima and then complete "Daybreak" in the Aramitama.

[Otonashi]

Circle around the estate and enter from the backdoor. You can enter through the front after clearing Echigo's main quests.