[Nagisa X Reader] Innocents, Or Killers?

This is a Nagisa X Reader story because, why the hell not, and I know a bunch of you Ansatsu Kyoushitsu (Assassination Classroom) fans probably just luv lil' Nagisa, cause like, I mean, he's actually rlly rlly faqing adorable. But, no one can really tell when you look at him, getting to know him, you try to learn if he is an innocent, sweet child, or a cold hearted killer, much like yourself I might add, did I not mention that in this fan-fiction you are a sweet child-- Err.. a cold killer? I can't tell ;) can you?

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(Y/n),
an orphan since she was a little girl taken in by an overly protective mother who controls her every way she can find and a father who just isn't around much, will she change from being in E-Class on just "another mission"?