The snow brings back fond childhood memories for Chiaki.

... If only Zenki could be so lucky.

In the winter of 800 years past, the demon Zenki was captured. The Kuzen household took charge of him, intending to make a profit off the thing which had just one thought: "kill." He was locked away and tended by the unloved bastard child of the Kuzen, a girl younger than Chiaki.