Ryuujin-sama to Amagoi no Miko

This is a world ruled by 8 million gods. One day, Kaguraga, a shrine maiden, is led by a mysterious raven to a great tree. There she finds Yakumo, the beautiful white dragon god. As soon as he saw Masashi, he said, "I have been waiting for you." After their fateful encounter, Masashi and Yakumo set out on a journey to save the gods of the land. What awaits them there?