The year is 1920, the 9th year of the Taisho Period. Lifelong philomath Kiyo Fukasaku is ecstatic when he's admitted into the Imperial University, and can't wait to begin his new life in the nation's capital...that is, until he gets lost and already finds himself on hard times on his first day in the big city. Luckily, he runs into Ozaki, an eccentric, seemingly well-off man who invites Kiyo to stay in his mansion after he learns about his financial troubles. But there's more to the handsome stranger than meets the eye. It turns out that Ozaki is a fox spirit who had some sort of connection to Kiyo's grandfather, Seishirou, and he invites Kiyo to live with him as a way to repay Seishirou's kindness. But just what kind of relationship did Ozaki and Seishirou have, and what does it mean for Ozaki and Kiyo?