I've read a few Japanese books this year, and this one is definitely my favourite so far. 

Yoshimoto's writing is beautiful and reflective, and not afraid to shy away from difficult subjects. I liked that every protagonist of these stories were female, and yet had such different voices and varied backgrounds. There were some really candid moments that surprised me (like the whole hole conversation) but it didn't put me off. I enjoyed all of the stories for different reasons and I think some of them will stay with me for a long time. I've already noticed myself thinking back on some of them. 

If you're looking for a heartfelt Japanese book which isn't superfluous then this is the one I'd recommend.