SPOILERS (obviously)

First of all...trigger warning, I'm giving you. I saw it nowhere written in near sight, but the story deals with a heavy mental issue and mentioning of self-harm. I was slightly shocked, and if I saw mention of it, at least I'm prepared.
The other thing - shock value. This manga is full of it, not for the better.
I'm not sure if the effect the author was going for was supposed to be dramatic...it wasn't, I was LOLing hard at the "badass" characters and the tragic yet hilarious turns the story took every fifth or so page.
Illogical decisions, total lack of comprehending the gravity of the situation and pages after pages of chatting and flashbacks just pile up for no reason. The tension is horribly forced. Oh, and that's a mighty spacious elevator, I must say. I swear I only saw similar in hospitals.

Also, the idea of a confession forced by a lacky detective agency under such extreme conditions (aka being literally threatened)? Are you kidding me?? I'm not convinced that could stand before ANY judge in case of a divorce.

But of course, this all becomes secondary, when we finally reach the final moments and understand what was the point of the whole story. A piece of advice: it doesn't worth it.
But the drawing style was fine, I'll give the artist that.