I heard of Hachiko's story many years ago, but it was only recently that I tried to research about it. What I found out made me cry in the middle of the night. Hachiko's story is so touching that a Japanese movie about it in 1987 became a blockbuster, and Hollywood just released their own version starring Richard Gere.
Here's Hachi's story from Wiki:
In 1924, Hachikō was brought to Tokyo by his owner, Hidesaburo Ueno, a professor in the agriculture department at the University of Tokyo. During his owner's life Hachikō saw him off from the front door and greeted him at the end of the day at the nearby Shibuya Station. The pair continued their daily routine until May 1925, when Professor Ueno did not return on the usual train one evening. The professor had suffered a stroke at the university that day. He died and never returned to the train station where his friend was waiting.
Hachikō was given away after his master's death, but he routinely escaped, showing up again and again at his old home. Eventually, Hachikō apparently realized that Professor Ueno no longer lived at the house. So he went to look for his master at the train station where he had accompanied him so many times before. Each day, Hachikō waited for Professor Ueno to return. And each day he did not see his friend among the commuters at the station.
The permanent fixture at the train station that was Hachikō attracted the attention of other commuters. Many of the people who frequented the Shibuya train station had seen Hachikō and Professor Ueno together each day. They brought Hachikō treats and food to nourish him during his wait.
This continued for 10 years, with Hachikō appearing only in the evening time, precisely when the train was due at the station.
That same year, another of Ueno's faithful students (who had become something of an expert on the Akita breed) saw the dog at the station and followed him to the Kobayashi home where he learned the history of Hachikō's life. Shortly after this meeting, the former student published a documented census of Akitas in Japan. His research found only 30 purebred Akitas remaining, including Hachikō from Shibuya Station.
Professor Ueno's former student returned frequently to visit the dog and over the years published several articles about Hachikō's remarkable loyalty. In 1932 one of these articles, published in Tokyo's largest newspaper, threw the dog into the national spotlight. Hachikō became a national sensation. His faithfulness to his master's memory impressed the people of Japan as a spirit of family loyalty all should strive to achieve. Teachers and parents used Hachikō's vigil as an example for children to follow. A well-known Japanese artist rendered a sculpture of the dog, and throughout the country a new awareness of the Akita breed grew.
Eventually, Hachikō's legendary faithfulness became a national symbol of loyalty.
Hachikō died on March 8, 1935. He was found on a street in Shibuya. His stuffed and mounted remains are kept at the National Science Museum of Japan in Ueno, Tokyo.
In April 1934, a bronze statue in his likeness was erected at Shibuya Station, and Hachikō himself was present at its unveiling. The statue was recycled for the war effort during World War II. In 1948 The Society for Recreating the Hachikō Statue commissioned Takeshi Ando, son of the original artist who had since died, to make a second statue. The new statue, which was erected in August 1948, still stands and is an extremely popular meeting spot. The station entrance near this statue is named "Hachikō-guchi", meaning "The Hachikō Exit", and is one of Shibuya Station's five exits.
