Lol, I find it hilarious that you and I had the same idea in mind between these two characters. Canon Adachi was pretty poorly written and it really showed. Your fic was well-written and I think you got the canon characters down pretty well.

A profiling method used to find clues to the perpetrator's psychology."

[More specifically, I believe it refers to the action patterns (from the walking stride to dominant hand), motive is not intrinsically bound within Modus Operandi]

She is a man, she can protect herself.

[I’m pretty sure she got over that “woe is me for not being born a boy”, though still wishing for some of those arbitrarily-designated masculine traits like independence and self-reliance]

lays her head on his chest and cries as he wraps his arms around her.

[I think she’s too quick to cry (at least the first time(s)), if this was the first it could indicate that here at the end she’d finally come to understand at least a glimpse of the chaotic, purposelessness that drives Adachi, and to somebody so logic and order-centered as Naoto it’s perfectly sensible that the very idea would terrify her]

Not what I had evisioned for this oneshot, but it didn't disappoint. Great work as always P.N.

For Naoto-kun whom created her image from detective fiction, where every crime has it's meaning and motive the acts of Adachi are not understandable at all, indeed she could not apprehend simplest of all reasons there is " I felt like it", "because I could", "it was hell of a fun"