Tatsuki and Ohta are two beings from a supernatural, mystical realm masquerading as "cousins" in the human world. Tatsuki is in fact the successor to Ryu-Oh, the dragon king, and possesses the power of the Nyoi-Houshu, a magical dagger. Ohta is a Zashiki Warashi, a protective house-spirit without a home and is also Tatsuki's subservient lover. When their human classmate Koushi Misaki accidentally witness the two having sex, he mistakenly...