Slash Mode:
In order to get eight of the twelve supporting characters to unlock slash mode.

Gun Toting Characters:
If you beat slash mode under 15 minutes, depending on which house you decide to beat it with, you get a different character.
For one, you receive Katze, and for the other, you receive the machine gun girl. You can only play as them on the VS and link
modes. 

Fight as sub-characters:
Complete decisive battle (story) mode and keep both sub-characters alive. Each sub-character may now be used in any other
game mode.

Fight as Katze:
Select a Shainto fighter and complete slash mode in under fifteen minutes. You may now be able to select Katze in versus,
group battle, and link modes. 

Fight as Tsubame:
Complete slash mode in under fifteen minutes with a Narukagami fighter. You may now be able to select Tsubame under
versus, group battle, and link modes. 

Chanbarra Mode:
Defeat all thirteen Bosses in action mode without using any continues. To access Chanbarra mode highlight the "Link Mode"
option on the main menu and press Down, Down. 

Hundred Slashes Mode:
To unlock the Hundred Slashes Mode complete the game with the six regular characters.