I remember that it was a manga about this girl who really likes this boy. (Haha yeah, sooo detailed) He's like the "nicest, kindest, and the sweetest guy". But he turns out to be a...umm... I forgot what it's called, but it's like a person who's job is to kill people, or criminals, or something. The guy tranferred to that school just to kill this (famous[?]) dude, who was secretly a criminal. Anyways, she's like totally shocked, and he turns out to be REALLY cold and strict. So in exchange for her not blowing his cover, he becomed her "boyfriend". And it gets really awkward since he constantly threatens her life. Ooh! There was this part where they go to this sweets shop or something and he becomes all nice(?)...and gave her chocolate(?). And that's all I remember(?).
Oh gosh... I'm not very good at explaining this.
I forgot the name... But I know that it was fairly short. I think it was a oneshot(?).
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Be kind to cute, innocent-looking girls.....because they happen to know everything.....
Oh wow... I even put that on my complete list! Thaaaanks soooo muuuch for reminding me~ 
