One hundred years ago, aliens landed on a mountain near where a small, white five tailed fox lived. After being stranded on Earth for one hundred years, they are ready for a test flight to see if they can return home. The test fails as one of the aliens makes a mistake, and the other aliens tell him to leave.

The runaway alien finds itself taken in by a class of students at the foot of the mountain. There, a teacher named Kang trains students who don't fit in at a regular school. To save the alien, the five tailed fox takes on the form of a human girl, and joins the school under the name of Yobi.

Staying at the school, Yobi becomes friends with one of the students, a boy named Geum-ie. She enjoys her time with the humans, until a fox hunter appears, as well as a shadow who gives Yobi a device which will allow her to become human by taking the soul from a human.