If you like Miyazawa Kenji, I think you'd enjoy it. There’s not only the museum but other places that are associated with him that you can enjoy too. http://www.kanko-hanamaki.ne.jp/en/kenji/index.html
I'm considering going to the Miyazaki Kenji museum. I like Japanese history and literature so I am interested in going, but as it would take up half a day I am wondering if it's worth it.