This is an excellent thriller + psychological + criminal story.
I wonder if the screenplay is based on a manga. In any case it kept me interested.

I'd suggest that you prepare at least 2 hours and watch the first two episodes together.
If you do so, then you get the whole flavor of the story and a perfect
impression on the power and maturity of the two main actors.

There is no better match for the two characters than Ayase Haruka and
Takahashi Issei. Their acting is formidable! I enjoyed every second of
their fabulous work. I had to watch several times some parts (especially of the episodes 2 and 3),
because the multitude of expressions and feelings that were conveyed were overwhelming.
The other actors were also chosen very well and each of them did a great job.

After the 4th episode I wanted to watch very slowly, because I wanted to
prolong as much as possible the pleasure of seeing the actors at their best time.
10 episodes seemed not enough. However, the action is a bit rushed towards
the end, there is a clear limit of such a drama. I liked very much the end.
It might make possible a continuation, yet I do not believe that it could be as good
as this period.

The music isn't too bad, yet not enough to be noted. There are much less good dramas
of this kind with much better music.

This drama is 150% worth its time watching!