Hifumi Abe is a dominant force in judo, unbeaten in the U66kg division since 2016.
Hifumi Abe is a dominant force in judo, unbeaten in the U66kg division since 2016.
Matt Roberts/Getty Images AsiaPac/Getty Images
His 17-year-old sister Uta has been no less imperious, despite the fact she is still a high school student.
His 17-year-old sister Uta has been no less imperious, despite the fact she is still a high school student.
Matt Roberts/Getty Images AsiaPac/Getty Images
In February 2017, Uta became the youngest ever winner on the IJF World Tour, taking gold in the Dusseldorf Grand Slam aged 16.
In February 2017, Uta became the youngest ever winner on the IJF World Tour, taking gold in the Dusseldorf Grand Slam aged 16.
IJF / Gabriela Sabau
She's still never lost a match outside of her native Japan.
She's still never lost a match outside of her native Japan.
IJF / Gabriela Sabau
After missing out on selection from the Rio 2016 Olympics as a teenager, Hifumi has become one of the sport's leading fighters, winning the World Championships at his first attempt in Budapest.
After missing out on selection from the Rio 2016 Olympics as a teenager, Hifumi has become one of the sport's leading fighters, winning the World Championships at his first attempt in Budapest.
MARTIN BUREAU/AFP/AFP/Getty Images
Both have earned reputations for their explosive and dynamic fighting style on the mat.
Both have earned reputations for their explosive and dynamic fighting style on the mat.
Matt Roberts/Getty Images AsiaPac/Getty Images
"Something I keep in mind is to never back down -- to always move forward and keep attacking," Uta told CNN Sport.
"Something I keep in mind is to never back down -- to always move forward and keep attacking," Uta told CNN Sport.
IJF / Gabriela Sabau
The brother and sister celebrated a unique feat at the Tokyo Grand Slam in December 2017 when they both came away with the spoils.
The brother and sister celebrated a unique feat at the Tokyo Grand Slam in December 2017 when they both came away with the spoils.
Matt Roberts/Getty Images AsiaPac/Getty Images
The two Abes are looking to maintain their dominance between now and their home Olympics in Tokyo in 2020.
The two Abes are looking to maintain their dominance between now and their home Olympics in Tokyo in 2020.
ATTILA KISBENEDEK/AFP/AFP/Getty Images
Hifumi has no doubt of his ability to shine in front of his home crowd, saying of the Olympics, "I will win."
Hifumi has no doubt of his ability to shine in front of his home crowd, saying of the Olympics, "I will win."
ATTILA KISBENEDEK/AFP/AFP/Getty Images
Modest and self-effacing off the mat, Uta is no less confident about her abilities on it. "My short-term goal is to win the World Championships in Baku later this year," she told CNN. "My mid-term objective is to win the Olympic gold medal at Tokyo 2020."
Modest and self-effacing off the mat, Uta is no less confident about her abilities on it. "My short-term goal is to win the World Championships in Baku later this year," she told CNN. "My mid-term objective is to win the Olympic gold medal at Tokyo 2020."
IJF / Gabriela Sabau
The long-term future certainly looks bright for these Japanese judo siblings. <a href="index.php?page=&url=https%3A%2F%2Fedition.cnn.com%2Fspecials%2Fsport%2Fjudo-world">Visit CNN.com/judo for more news and features</a>
The long-term future certainly looks bright for these Japanese judo siblings. Visit CNN.com/judo for more news and features
Gabriela Sabau / IJF