As a puppy and oldest of the litter he is caring and considerate when he begins to worry about his brother Jirōmaru and shows bravery when he lead his siblings to find him.
Ginga Densetu Anju To Jirōmaru
Tarōmaru lives together with his mother, his siblings, and Anju and her grandfather Yoshito Sawamura. One day, Yuki and Yoshito Sawamura do not return. A few days later, Yuki hobbles home in bad shape.
After this Anju's uncle, Shinjirō, comes in and forces Anju to leave. Jirōmaru goes after Anju and tells Tarōmaru to take care of their siblings.
Tarōmaru leads siblings to the place where Yoshito Sawamura and Yuki's accident occurred. There they meet Jirōmaru, Anju, and Seisaburō. Shinjirō comes in with a gun and shoots at Anju and Seisaburō. Jirōmaru jumps between Shinjirō and Anju, dying in front of Tarōmaru and the others' eyes.
19 years later Tarōmaru is still alive and Anju greets him.
- Although Tarōmaru and his siblings are around the same age as Weed's puppies, at the end of the story he and his two remaining siblings are much older. This is a mistake on Yoshi's part, probably due to the fact that the dogs in GDATJ were not originally intended to be related to Gin and his family.