The cute and innocent high school boy Cyan ends up living alone in his house with his handsome live-in housekeeper, Haguro, after his parents relocate for work. What begins as a relationship where Cyan is simply spoiled and cared for soon turns into a new, naughty, and heart-pounding daily life for the two of them. Elsewhere, Cyan's well-mannered and model classmate, Natsume, ends up with his teacher, Mr. Sakuma, acting as his guardian when Natsume struggles to take care of himself. These two high school boys find themselves drawn into unstoppable romances with the adults who look after them.

Hina and Nata lived as childhood friends born on the same birthday in the same year. However, after entering high school, Nata decided to leave the town and gradually became estranged from Hina because of that. One day two witches Sabbath and Pargo mysteriously landed on Earth. Hina protects Nata from one of Sabbath's attacks and receives a fatal injury. The other witch, Pargo who saw that gives Hina and Nata a magical power at the cost of his body, and tells Nata to go on an adventure with Hina to regain his lost body. Thus, the adventurous journey of Hina and Nata began to regain what they lost and to stop the ambition of the Sabbath.