Naruto Shippuden: Ultimate Ninja Heroes 3 is a PSP exclusive title that features an original storyline.
Ultimate Master Road
The game's single-player mechanic includes some side-scrolling action sequences interspersed with major fights in a 1-4 ninja fight. The story was written especially for the game, and takes place early in the series' "Shippuden" arc.
4 Player Battle-Royale
From one to four players can duke it out via ad-hoc.