Where is the chemistry? NONE.
I love the art, so freaking beautiful, but the story? Nah.
The characters? So so. Not gonna lie, I hate the Holy Maiden and her 'clueless, naive, and too kind'-self. She had no logic in her brain at all.
But I like Sei, and his logical reasoning.
Now, the plotline. So far, nothing really special and interesting. I rolled my eyes when they had to have sex, to cure him. I felt it was just the Author looking for reason to add sex scene in the beginning. To sell the story, however for me personally, I prefer if the author build the character's chemistry first.
After all, not like what I was expected, but it was decent.