Duel Love: Koisuru Otome wa Shouri no Megami Cheats - Nintendo DS
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Unlock Collection Mode
After you get the ending for one guy, you will unlock "Collection" mode where you can access that guy's pictures and mini-games as well as listen to various background musics.
Unlock Special Character
After you have attained a happy ending for each of the 5 available characters, you will unlock a special character that you will be able to interact with in the game.