First ending: Finish Chapters 1 to 8.
Second ending: Unlock Chapter 9 (withdraw 80% life of the Black Dragon in less than 4 minutes 20 seconds in Chapter 7 Verse 4).
Third ending: In Chapter 9, finish the third verse in less than 4 minutes 20 seconds.
Fourth ending: Finish the twelve chapters and the three chapters of your companions.
Fifth ending: Recover the 65 weapons to unlock the Chapter 13 and finish it.