You need to go south and use the item on the corresponding temple so that you can access the area in question.
Once you gain the akashi records from that area you can return and find the others to get their key items.
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1. The bad ending can be gotten by traveling to the small forest to the south while travel through the great lake to the eastern lands.
2. You can get the 'Neutral' Ending by not having the dragon forms and/or fighting against Fu-Long.
3. The 'Future' Ending you get by having the dragons forms and then fighting Fu-Long.
4. The 'Lovers' Ending is gotten by having the dragon forms, fighting Fu-Long, speaking to the weretiger while he's inside the blacksmithing area and having him and the Dragon Slayer/Protector fight. That will give you this ending.