Defeat all thirteen Bosses in action (Boss) mode without using any continues. Then on the main menu, highlight the "Link Mode" option and press Down(2) to access Chanbarra mode.
Beat the game with the six regular characters.
Select a Narukagami fighter and complete slash mode in under fifteen minutes. Then, Tsubame will now be selectable under versus, group battle, and link modes.
Select a Shainto fighter and complete slash mode in under fifteen minutes. Then, Katze will now be selectable under versus, group battle, and link modes.
Beat Boss mode without using any continues. Then, an option for "Slash Mode" will appear on the main menu.
Beat decisive battle (story) mode and keep both sub-characters alive. Then, the sub-characters can be used in any other game mode.
To beat Slash Mode in under 10 minutes, use Tony (you know, the cool black dude in the purple). Most always, you only have to use the run and slash trick. The secret is not to start running as soon as you kill a guy. Instead, wait until the exact moment the next guy appears and press the upper left button on the top of your controller so that you can face him before running toward him. This most always guarantees an instant kill.
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