Sickening.Pure...sugar..diabetes.. and a fair amount of cringe.
The dirty little secret of shoujos - this series is. If naivety, pretty boys, and truly wholesome energy is what you need, boy this is the drug-- I mean series for you. It's been awhile since I've read any wholesomely pure series, but this easily tops all romance series when it comes to only pure clouds and sparkly romance. It's the tweeny- middle school love of a dork and a supposedly dark edgelord of the demon world. The plot isn't new. Steal a human girl's soul/virginity and you become a greater demon-- except 110% your target is a bit ditzy and honestly the most angelic that any girl can be. Yup. That's it. That's the story line. It has zero room for risque.
If that alone hasn't turned you away yet, then you'll probably enjoy it. Because Shion is a best boy that's really trying his best. And that's maybe the reason why you're here - to discover a true best boy.