Teio, the son of King Soryuu - also known as the Emperor of Thunder - has a divine duty to track down and eliminate demons in the human realm. He has always been dedicated to carrying out his father's wishes... until his path crosses with Keika, a strikingly fragile and gorgeous demon with violet skin, hair, and eyes. Instantaneously smitten, Lord Teio chooses to spare his newfound love's life and instead takes him to reside in heaven. What sort of relationship will blossom between the naive celestial and the alluring demon?