Unlock Matryoshkas
Beating the demo gets you extra items for the game:
Matryoshka AT - Load saved demo file.
Matryoshka DF - Load saved demo file.
Matryoshka LC - Load saved demo file.
Matryoshka MA - Load saved demo file.
Matryoshka MD - Load saved demo file.
Matryoshka SP - Load saved demo file.
Matryoshka TC - Load saved demo file.
New Game+
By beating the game, you'll unlock the New Game+ option. In it, your children, quests, heroines, items, city level, glow, and database will be transferred from your chosen old file to a New Game.