Strange Dragon

During the last Houryou festival when it is said that the oceanic Gates of the Ryuuguu (Dragon Castle) open every 7 years, Yura found Nao on the beach. Without any relations, Yura takes him in as her younger brother. Thus they happily grow up together for the next 7 years, but now that the next Houryou festival is looming, Nao seems to be acting strangely...

Yamato is the son of a human and the most powerful snow woman. One day a young snow woman named Hiori came to take him back to the village of the snow women. It is said that the kiss of a snow woman could freeze a man's heart. That's what Hiori intends to do to take Yamato back to the village. But how will Hiori accomplish her mission when Yamato, who isn't mesmerized by the usual enchantment of a snow woman, doesn't let Hiori come near him?