A moving journey to meet the one and only family. 
The dog, which is the main character, sets off on a train to search for his only family, his grandfather. A dog with no family and a grandfather who lost his family and lived alone for a long time met and spent days of happiness with each other, but one day, the grandfather left the home without saying a word. Will the two be able to meet again? 
This book started when the author saw the number of abandoned dogs rise parallel to the growing number of visitors to beaches. The dog doing all it can to hold on to family makes us think about animals that live with us and should be respected. Furthermore, it urges readers to think again about their family who they might have taken for granted.