Finish the indicated task to unlock the corresponding alternate ending. Note: To unlock all the endings easily, successfully complete the game and save when prompted. Load that saved game file to resume from the second part of the game. Additionally, the second playthrough has additional story scenes and the third playthrough gives you with the option of endings C and D, or ending B again if you fail to meet the goals for those endings. Finally, ending D will delete all of your saved game data except for the settings.

Ending	How to unlock
Ending A	Finish the game.
Ending B	Finish the game with a cleared saved game file after unlocking Ending A.
Ending C	Finish 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.
Ending D	Finish 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.