There's not much to say about this manga.
The story is very simple:
A girl receives letters from an unknown stalker, then a knight in shining armor saves her, and then they have sex. That's it.
The other one shots' story line are also very simple and the MC somehow ends up having sex with one of the male characters.
The art is decent, (too common, if you ask me). It's drawn the typical "shoujo-style" with big eyes and slender hands. Also, the sex scenes are drawn alright, there's no explicit images at all.
And that's it.
Overall, I gave this manga a score of 7.
Both story and art were okay and it wasn't that bad. I only find the situations and female MC's actions ridiculous.
This manga is one of those I've read that wasn't too bad, and wasn't too good either; the ones that doesn't really leave you a strong impression after reading it.