[There was no signal to its arrival, but at some point in the day, a (not exactly wrapped) package seemed to appear on the ground beside the front door. A tidy folder with several papers inside rest beneath a box of assorted chocolates; both carefully placed so they were out of the way but wouldn’t go completely unnoticed. On the folder was a sticky note with careful (probably too careful; a bit nervous) handwriting:

“I decided I didn’t want anything to do with this case,
and I wasn’t sure what to give you for the
occasion. It turned out to be rather interesting – maybe
you can make use of it.
Do what you’d like with these. My apologies.
Happy birthday.”]

–

“An interesting case from my beautiful colleague, Kirigiri-san? How curious… and so sweet that she remembered my birthday." 

”…goodness, it… Hm. I… I think I shall tread lightly. I am curious, but caution is prudent. Not so much for my safety, but rather, the potentially personal perspective present in these papers…“