I love Nakatani`s works, and this one alongside Mimesis dolls is my favorite. Interesting idea of what Yuuka`s nature as a youkai is and seeing how Marisa slowly arrived to the answer was very satisfying.
How often do you see Keine being the one who suffers because Mokou is immortal? As expected of Nakatani, this was a great read and the scene in which Keine tries to rip off Mokou`s liver was strangely... hmmmm... arousing?