The Oanechan Blue

All bonuses:
Quickly press R3, L3, R2, L2, R1, L1, Square, Triangle, Circle, X, R3, L3, R2, L2, R1, L1, Square, Triangle, Circle, X at the title screen.
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Alternate costumes:
Have a saved game file from The Oanechan Bara to start with Saki's, and all of Aya's original five costumes unlocked.

Aya original costume 1:
Complete five quest mode quests in story mode.

Aya original costume 2:
Complete six quest mode quests in story mode.

Aya original costume 3:
Complete seven quest mode quests in story mode.

Aya original costume 4:
Complete eight quest mode quests in story mode.

Aya original costume 5:
Complete nine quest mode quests in story mode.

Aya 2:
Complete two quest mode quests in story mode.

Hard mode:
Complete level 6 in story mode under the normal difficulty setting.

Violent mode:
Complete level 6 in story mode under the hard difficulty setting.

Makoto:
Complete level 6 in story mode as Riho.

Makoto 2:
Completely fill the ???? gauge.

Riho (17):
Complete ten quest mode quests in story mode.

Saki:
Complete level 6 in story mode as Aya.

Saki original costume:
Complete four quest mode quests in story mode.

Saki 2:
Complete three quest mode quests in story mode.

Wallpaper 1:
Complete one quest mode quest in story mode. Then, press L1, L2, R1, or R2 at the mode selection screen to switch to the new wallpaper.

Wallpaper 2:
Complete level 6 in story mode under the hard difficulty setting. Then, press L1, L2, R1, or R2 at the mode selection screen to switch to the new wallpaper.

Wallpaper 3:
Complete level 6 in story mode under the violent difficulty setting. Then, press L1, L2, R1, or R2 at the mode selection screen to switch to the new wallpaper.

Action Replay, Code Breaker, and GameShark codes