The first episode definitely made me a fan. The characters (which come in pairs) were very effective in drawing attention and curiosity with how they express their feelings towards each other. How far will they go? What'll happen next? Is someone actually gonna lose their ears? What really happened to Seimei?
However, it was kinda disappointing how the series ended, without any action and without any answers, leaving the viewers with nothing at the last episode. The mystery and suspense of the story is very catchy and will make you want to know what'll happen next. But the end did not deliver much and did not reach the expectations set up by the (unanswered) issues in the beginning.
The story is promising and I think the characters have the potential to grow. I think the series is too short to make the story work and a second (answer) season would be greatly appreciated.