Luggage storage tokyo station

is there a place at tokyo station to store you luggage for 3-4 days without using the coin lockers?

Can't you ask your hotel or hostel to keep your luggage after checking out? Japanese normally allow you to do that without additional charge.

Thanks, will try that first.

Tokyo Station has a luggage storage area outside the Nagano Shinkansen entrance.

There are many "coin lockers" in Tokyo station. But big boxes for suitcases are often fully occupied during the day.
I think you can ask your hotel to keep you luggage or send it to your next destination by takuhaibin (delivery service).

You can store things in a coin locker more than 3 days. They'll open it and confiscate the content if you do. There is a left luggage counter in Tokyo Station where you can leave your stuff longer than 3 days. It's near Gin-no-suzu.