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Prinny: Can I Really Be The Hero?

Alternate Story
At title screen, highlight "New Game" and enter: Triangle, Square, Circle, Triangle, Square, Circle, X

Alternate Endings

Ending 1 - Lose all 1000 lives
Ending 2 - Complete the game
Ending 3 - Finish Asagi Mode
Ending 4 - Talk to the Ninja and choose the first option

Asagi Mode
Pick up all of the Torn Letters.