Unlock the following alternate endings by performing the corresponding tasks. To unlock all endings, complete the game and load the saved game file to resume from the second part of the game. The second playthrough will have extra scenes and the third playthrough will give you the option of viewing ending C or D, or B if you fail to meet the requirements. Ending D will delete all saved game data except for your settings:
HOW TO UNLOCK
Complete the game.
Complete the game with a cleared saved game file after unlocking Ending A.
Complete the game after unlocking Endings A and B, then fight a Boss after the Ending A or B final Boss; when given a choice choose the top option.
Complete the game with Ending A and B, collect all 30 weapons, and fight a Boss after the Ending A or B final Boss; when given a choice choose the bottom option.