At Daimon High School, students settle disputes by dueling in the official K‑Fight arena. Ryoko Mitsurugi, a samurai girl and undefeated K‑Fight champion, is summoned by a mysterious priestess to protect Earth from an invasion that comes from the alternate universe of Solvania. She must confront battles that test her skill, her friendships, and her heart, ultimately discovering her true strength as a samurai warrior.