Jack first meets Saburo at the dining table in a hall in Niten Ichi Ryu. Saburo later gets him and Yamato into a bit of trouble with Sensei Kyuzo after expressing disbelief at some of the teacher's claims. Kyuzo then demonstrates his prowness by asking Saburo, Yamato and Jack to attack him, all three end up on the floor in a matter of moments.
He later takes part in the fighting competion between the Niten Ichi Ryu and the Yagyu Ryu.
Saburo enter the kukai contest. Then he takes arrow for Jack when Moriko tries to shoot Jack at the burning of Taka-no-ma and he has to stay behind when everyone is leaving for Osaka Castle due to his injuries with Kiku looking after him.
He appears in the ring of fire in the market near Tamagashi Village. Meanwhile Jack is looking for loyal and trustworthy samurai who would protect the town from Akuma. They defeat Akuma and head off to the port of Nagasaki.
In this book it is hinted he may have some romantic feelings for Kiku as he was partly going out on his trip as a way to impress Kiku's family.
During this book it is noted that Saburo gets very seasick and he grows to hate boats.
He declines Jack's offer to go with him to England due to his feelings for Kiku which Jack understands.
He is described as being on the large side with prominent eyebrows that look like large black hairy caterpillars. Also, he is known for his huge appetite, which probably resulted in his round belly.
- Kiku - In the Ring of Fire and the Way of the Dragon it is hinted a romance may be forming between him and Kiku, another samurai student who was at Niten Ichi Ryu. He declines Jack's offer to go to England because of Kiku.
- Taro - He is also the little brother of Taro who has perished in the Battle of Osaka Castle. Saburo was always a little tense around his brother as he didn't like having to live up to his brother's name, his brother being an excellent Samurai student.