Legend of the Demon Sealing Blade

translated from ebookjapan:

With his long, black hair, graceful features, and feminine speech, Mikami Retsu is an exorcist who is often mistaken for a woman. Byakugain Gou, an onmyouji, is a freeloader who happened to end up staying at the Mikami household. This is a supernatural fantasy tale involving these two men. It begins when Mikami finds out that Yamada Satoshi, a teenaged boy, has been put under a deadly curse. Mikami attempts to break this curse, but...