Night Sky of Yokai

After losing his father, Rikuo finally meets his mysterious aunt, Nadeshiko, who calls herself Nana Sawada. She is his father's older sister and is half-Nurarihyon and half-Kitsune. He grows close to her and comes to treasure her like his own family. However, when she leaves his household, she promises to come back with her Hanyō son. Three years later, he finally meets the sheepish Tsunayoshi Sawada, who turns out to have never known about his own yokai blood and the entire yokai world?! Rikuo has his work cut out for him to teach his cousin about their fun, mysterious world.