Hakoiri Devil Princess

Japanese Title: 箱入りデビルプリンセス

English Title: My Dearest Devil Princess

Plot
The series follows the life of High School student Keita Kusakabe, who is given a magical box by his friend and fellow student Natsuki Morishima. Keita has obtained the box in hopes that, as per legend, his wishes will be granted. He opens the box and out pops Maki a powerful devil, she at first tells Keita she's a genie that will grant three wishes whatever they may be. At first Keita can't decide what he wants and decides to sleep on it, later the next day Keita accidentally walks in on Maki who has just finished taking a shower. Now that she is without clothes Keita spots Maki's wings and tail, and realizes that she is in fact a devil.

Maki reveals that once Keita has used all three wishes, she will take his soul. Unfortunately for her evil plans, she is inexperienced and doesn't even know how to be evil. She must stay with Keita until she can trick him into making his third wish while also teaching herself to be evil, but matters are complicated further when she starts falling in love with him.