I registered for a bank account at Shinsei with a temporary address and phone number. They let me open the account but Shinsei will lock your account after about a month if they can't deliver a piece of registered mail to your house.So just to double check - sorry it's still early here and I just got up, my cognitive skills are still booting up - I can't open a bank account while staying in a hostel or something comparable - that doesn't have a formal lease?
I know my friend was able to open one while staying in a share-house, so I might have to look into that too.
Thanks.
I don't know anything about JP post though.