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One of four new costumes is unlocked after getting 10 quests, getting 20 quests, getting 30 quests, and completing Story mode under all difficulties. A fifth costume is accessed by choosing Aya by pressing Z at the character selection screen.

Successfully complete the game under the Violent difficulty setting.

Have either Young Aya or Young Saki unlocked. Press Z on the "Young" version of the girl you have unlocked. Before she loads, quickly switch to the other girl (that you do not have the "Young" version unlocked). The "Young" version of the character that was supposed to be locked will instead load.