Sanshiro, a teenage martial artist, trains in the Kurenai School of Jiujitsu and searches for his father's killer. Accompanying Sanshiro is an orphaned boy named Kenbo and his pet dog Boke. Sanshiro's only clue to his father's murderer is a glass eye left on the scene of the crime, suggesting that his father's murderer was one-eyed.

After one last tournament and an embarrassing loss in the final round, Michi decides to call it quits on the sport of judo. Between high school social activities and entrance exams, she’ll have no time to compete in the martial art she loves most, but putting aside old hobbies is a normal part of growing up. Still, the love of judo lingers—and it comes back full force when she meets her new classmate Towa, the girl who bested Michi in her final match! Towa wants to form a judo club at their school, but she’ll need new members to get it up and running. United by their love of judo, they’ll throw in their passions into the ring together and score ippon again!

A Judo student and a dashing young man who plays piano are both of interest to young Nonoka Aida. Then her childhood friend shows up from abroad to keep his promise that he would marry her as declared by her deceased father on his deathbed. This newcomer is determined that Nonoka is destined to become his bride but he will need to stand up to her amazing Judo skills and the affection she shows for her two classmates.

A story about a student who starts a judo club for the wrong reasons and has to keep it going when it blows up.