Heart's Dead, but the Blade's Alive

You are Nawa, adopted into the Kimino family by the domineering Suizo. For the longest time, you had fought in the Dead or Alive tournaments for his approval, aiming to be the most powerful ninja there is. Helping you is an invention of your father's called the Shinobi Driver, enabling you to transform into an armored figure known as Kamen Rider Shinobi.

In the aftermath of a heart-breaking adventure, your father assigned you to find Honoka, a girl with a mysterious power from her gloved hand, and win her heart. Fate soon brings you and Honoka together, but along with a growing relationship comes a dangerous chain of events tied to the sixth Dead or Alive tournament.