This is a Yoko Ogawa appreciation zone.

The writing in this was so delicate and moving. I may be biased since I minored in math and absolutely love number theory, but I found the description of math incredibly charming. I identified with all three main characters deeply, and consequently even liked the baseball bits (and I don't care for baseball). This book made my heart happy.

Recommended if you want to ponder on themes of beauty of the natural world (including numbers), friendship (between generations), and the importance of memory.