Tatsuki and Ohta are two beings from a supernatural, mystical realmmasquerading as "cousins" in the human world. Tatsuki is in fact the successorto Ryu-Oh, the dragon king, and possesses the power of the Nyoi-Houshu, amagical dagger. Ohta is a Zashiki Warashi, a protective house-spiritwithout a home and is also Tatsuki's subservient lover. When their humanclassmate Koushi Misaki accidentally witness the two having sex, he mistakenlybelieves...