As is known, the majority of Japanese yokai spirits are not hostile to people simply do not want to interfere in those affairs of others. But the spirits are different, and grows in a secret world power - Nurarihyon, the head of the Nura Clan and all youkai Japan, an old man,but still has not announced the name of the heir. The leader of the Nura Clan and his loyal vassals hope that the family business will continue to Rick, 13 -year-old grandson of Nurarihyon carrying a quarter of demonic blood. That`s just a guy from early childhood familiar with otherworldly problems, does not want to take power, determined to live my life man.However, the blood - is thicker than water, the existence Rica itself upsets the balance of forces that would like to correct not only many youkai, but also people. One day, in order to protect himself and his friends, the protagonist wakes up demon blood - so was born his alter - ego, " Rick night," the true heir and master of the invisible world. From now on, no turning back,and the young man would not only have to agree with the second half, but also to adopt a new purpose in life. Of course, to live and to solve problems in two worlds much harder, but now complete with a childhood girlfriend also Yuki-Onna attached!