To summarize the theme of Sexy Guardian: All men are rapists in waiting, so best to find one that you kind of like who can protect you from everyone else.
Story (2): On a high level, this is pretty stereotypical: girl goes to new school, finds "knight in shining armor", they fall in love. It's a sexist storyline anyway, and this is a poor rendition of it. Basically, the plot revolves around someone noticing the main girl, trying to rape her, the hero swoops in and saves her just in time, then they have a small falling out and it all happens again.
(5): Stereotypical shoujo/josei artwork. Looks like dozens of other manga.
Character (1): Seriously, every guy in this manga is a rapist, except for the "knight in shining armor" (although he's a bit aggressive about sex as well) and the kindly uncle. The girl is completely incapable of speaking up for or defending herself. Just horrid.
Enjoyment (2): Maybe if you like to watch a girl get attacked over and over again... actually, if you're that kind of pervert, just give in and go find some rape-fetish hentai.
Overall (2): Just awful.