12 days in Japan

Hi there, my friends and I are planning a Japan trip with the following itinerary:

21-25th February in Tokyo
25-27th February in Nagano (we're planning on going through Naraijuku, up to Togakushi Shrine)
27th-29th February in Tokyo (my friend) I'll be staying in Tokyo until March 3rd

My initial instinct is that I don't think JR pass is worth it cause we're not going as far as Osaka/Kyoto or the likes. But should I get any Tokyo-specific pass maybe? Or would I be better off just getting a Suica pass and topping it up as I go?

Thanks for the help!