After your character dashes forward, immediately press Up-Left, then Forward (don't release). You should see your character run backward.

To play as the bosses, choose "Team Edit" at the Character Selection screen. Now hold Start and press Up + Y, Right + A, Left + X, Down + B.

At the character selection screen, hold Start and press Up, Y, Right, A, Left, X, Down, B.

Choose Chizuru,Iori and Kyo andyou should able to see a special story.