Unlock the following endings by performing the corresponding tasks:
HOW TO UNLOCK
Use the Paranoia Soul to enter the mirror during the second battle with Dario Bossi, defeat Aguni, then return to the other side of the mirror and get the Magic Seal. Then, go to the center of the castle and enter the Boss door without Mina's Talisman.
Use the Paranoia Soul to fight Aguni. Collect the Magic Seal, then return to the center of the castle. Have Mina's Talisman equipped when you enter the Boss door, then beat the game.