Review
Plot: the twist was interesting. I've never thought that it will turn this way, but speaking about the lenght of the manga, somehow it was clear that something like this will show up.
Character Design: The anatomy of the characters was acceptable. The number of characters was fine for a chapter.
White/Black balance: The balance was good and the manga-ka worked a little bit with patterns for background or some shadows.
In addition: The story was romantic and the situation could appear in the real life. The art style is a little bit common, but is quite normal for a shoujo manga (starting from somewhere around 2008 until now, you'll see some stereotypes).
All in all, the manga is cute and it can be easy read.
You should give it a shot.
1/3 No Kareshi