Outside the Shibuya train station in Tokyo is a statue commemorating an Akita dog named Hachiko. Hachiko is remembered for unusual faithfulness to his owner, a university professor who commuted from the station daily. The dog accompanied him on his walk there in the morning and came back to meet him every afternoon just as his train arrived.

One day the professor didn’t return to the station; sadly, he’d died at work. But for the rest of his life—more than nine years—Hachiko showed up at the same time as the afternoon train. Day after day, regardless of weather, the dog waited…