Tenko Kuugen is a thousand-year-old demon/yokai fox that served as a guardian god for hundreds of years. Kuugen is able to use all sort of spells, but has an extremely mischievous personality, playing all sort of pranks, until finally the Mitsuji family sealed it up, until the present day, when a situation forced them to free it for Kuugen's help. Even though, Kuugen doesn't hate the Mitsuji family. After the crisis, it quit it’s job and became the guardian god of the Takagami family. Kuu is extremely smart and curious, it was able to figure out modern world technology, and learned to blend in in very quickly. But Kuu still likes to do as they please. Kuu is too old to remember its original gender, so it takes both male and female form. Kuu likes the Takagami brothers and does all it can to protect them at all cost.