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The following features in the game are ALL unlocked during gameplay by completing the indicated task.
Unlock Saki:
Complete Stage 1 of 2-Sister Story.
Unlock Saki Costume 2:
Complete 6 Quests.
Unlock Saki Costume 3:
Complete ALL Quests.
Unlock Saki Costume 4:
Complete 2-Sister Story in Berserk mode.
Unlock Saki Costume 5:
Complete Futaba Story in Normal mode.
Unlock Saki Costume 6:
When selecting Saki press the 'Start' button.
Unlock Aya:
Complete Stage 1 of 2-Sister Story.
Unlock Aya Costume 2:
Complete 4 Quests.
Unlock Aya Costume 3:
Complete 10 Quests.
Unlock Aya Costume 4:
Complete ALL the Blood Gates.
Unlock Aya Costume 5:
Complete 2-Sister Story in Berserk mode.
Unlock Aya Costume 6:
Complete Futaba Story in Easy mode.
Unlock Eva:
Complete 2-Sister Story in Hard mode.
Unlock Eva Costume 2:
Complete Futaba Story in Violent mode.
Unlock Kiku and Hana:
Complete ALL Quests
Unlock Makoto:
Complete Stage 1 of Futaba Story.
Unlock Reiko Costume 2:
Complete 6 Quests.
Unlock Reiko Costume 3:
Complete Futaba Story in Hard mode.
Unlock Riho and Makoto Costume 2:
Complete Futaba Story in Berserk mode.
Unlock Wallpaper 1:
Complete 1 Quest.
Unlock Wallpaper 2:
Complete 2 Quests.
Unlock Wallpaper 3:
Complete 2-Sister Story in Violent mode.
Hard, Violent and Beserk mode are unlocked when you have completed the game in the indicated mode.
Unlock Hard Mode:
Complete the game in Normal mode.
Unlock Violent Mode:
Complete the game in Hard mode.
Unlock Beserk Mode:
Complete the game in Violent mode.