This manga is basically cute vampire fluff. I like the world-building concept, but I'd like to see fewer characters introduced in the first book of the series and more of a focus on developing Ichii and En both as individuals and as a couple. 

A bit of angst, a couple of spicy sex scenes, and some intriguing world-building plus a mystery kept me reading until the end of this book, but I'm not dying to get my hands on the rest of the series. Overall, it's a fun read, but despite getting my hopes up based on the description, it didn't push my buttons as hard as it could have.