Makai Ouji is absolutely incredible and is one of my favourite manga of all time. This series means everything to me. Gorgeous art and great characters. The ending has me in tears everytime I read it. Highly recommend it to anyone who wants a manga with great art, BL themes that aren't gross/fetishization, awesome worldbuilding, lovely character designs, or all of the above. Though if you want a series with a large and active fandom, you're unfortunately out of luck. In my opinion it's still worth it, though. If you're here from the anime then please read the manga from the beginning, the anime doesit absolutely no justice.