After a long day, high schooler Shintaro Tokumitsu's plans for relaxing in his studio apartment take a turn when he discovers an angel on his balcony. The divine girl, Towa, reveals she's there to study humanity, and yet, despite his skepticism, he agrees to put her up. Prepare for the most heavenly and high jinks roommate experience of all time!

Leticia Dorman, daughter of a duke, is less than thrilled to be engaged to a crown prince. Betrothed since childhood and trained to be queen, she always hoped Prince Clarke would fall for someone else one day. So when he shows up at a ball with another woman, Lettie excitedly retreats to the countryside to start her new life—only for Clarke to appear, determined to win her heart.

One night, a strange object falls on the head of Nitta, a member of the yakuza. Inside the box is a strange young girl named Hina. She has tremendous supernatural powers, and Nitta finds himself reluctantly taking her in. Her powers can come in handy for his yakuza business, but he also runs the risk of her using them on him! Not to mention, if she doesn't use her powers, she will eventually go berserk and destroy everything around her. Nitta and Hina's strange life together is just beginning...