Easy mode
 
 Start a game and die three times. If done correctly, a message will 
 appear to indicate that a new easy difficulty setting is available. 
 Note: You cannot achieve an "Onimusha" rank when playing in easy 
 mode.
 
 
 
 Hard mode
 
 Successfully complete the game on the normal difficulty setting 
 to unlock the hard difficulty setting.
 
 
 
 Ending bonuses
 
 Successfully complete the game to unlock the Scenario Route option, 
 Man In Black Suit mini-game, Oni Organization mini-game, and the 
 Puzzle Illusion Dream Dimension mini-game.
 
 
 
 Strongest equipment mode
 
 Successfully complete the game on the hard difficulty setting. Then, 
 start new game to begin with the Blazing Fire Sword, 20,000 in money, 
 30 Intense Medicines, 10 Wood, all level 3 armors, infinite ammunition, 
 and skill always full.
 
 
 
 Issen mode
 
 Successfully complete the Oni Organization mini-game to unlock issen 
 mode. You must hit with a One Flash attack in order to do damage 
 to opponents.
 
 
 
 Puzzle Illusion Dream Dimension
 
 Successfully complete the game with all Paintings Of Beauties to 
 unlock the Puzzle Illusion Dream Dimension.
 
 
 
 Leather costume
 
 Successfully complete the game with the "Onimusha" rank to unlock 
 a leather costume.
 
 
 
 Oyuu's alternate costume
 
 Get a 100% scenario completion to unlock an alternate costume for 
 Oyuu.