Other than Tokyo, Kyoto, and Osaka, which Japanese city do you most recommend someone visit, and why?

I visited for the first time last year and will return this November. I want to travel and see more of the country. I loved Kyoto for the culture and the temples, and the small boutique shops. Love Tokyo for how it has everything there. Enjoyed Osaka for Universal Studios, I like amusement parks but not a fan of Disney.

What other city would you recommend visiting and why?