Kon★Puri

The story is about a girl named Tenko who plays basketball. There is a boy (who also plays basketball) whom she has a crush on. One day she encounters a demon, with the shape of a fox. This fox-demon now possesses her body as he looks for his missing tail. As he searches for his tail in Tenko's body, the fox helps Tenko become closer to the one she loves, with magical tricks.

(Source: Starry Heaven)