This is the worst in the "Sleepless Society" saga. I thought of dropping it halfway, but then I convinced myself that it wasn't that bad. I should have dropped it. After a certain point I started hating the two protagonists and the last episode was just a big disappointment. I swear to god, I just wanted to see them dead.

So the story doesn't offer anything interesting. It starts as a very strange mystery: the protagonist wakes up with a dead body besides her. The most obvious conclusion is that she is the killer, but we are led to believe that she is innocent. All the characters are trying to uncover the truth, by creating even more problems. People get killed and after everything that went on, the most obvious conclusion turned out to be the right one.
I really hated Kate. She starts acting victimistically, pretending to be helpless and fragile, but in the end we discover she had all planned out since the beginning. In the last episode she implies that the producers wanted us to hate her, but this actually made everything worse for me, because it means that the series is not only bad, but it's bad ON PURPOSE. I empathised more with Rat, who was supposed to be the bad guy, because at least he had a sensible reason to go about blackmailing and killing people, whereas Kate did everything out of sociopathic selfishness.

The main concept of the story was already mentioned in "Sleepless Society: Insomnia" and further developed here. It's really about what is more important between Love and Justice. Kate is a sociopathic character who is able to manipulate her victims by messing with their feelings and sense of empathy. I think the moral message in the last episode is really important, but they failed miserably at portraying it with this story.

Don't waste your time with this, it's not worth it.