I have watched a lot of crime dramas and I've like most of them, and this is not an exception...

Even though the story isn't super unique you don't really feel bored, as if you've seen it before. What this show does have, that a lot of crime dramas don't, is the focus on the feelings that everyone have.
The victims, family and friends of the people that has left the world and even sometimes the murderers feelings.
What made them commit the crime?? What were the victims doing before they died and what did they do that caused them to become the victims??

The fact that this drama went into that territory and not only focused on the crime solving itself, is what made this show in my opinion.

The acting from the main cast is really great Ueto Aya did a great job of being a "pure" newbie without being too naive and slowly growing as the series progress.
Though I did feel that in some instances some of the guest characters could be a bit stiff in the acting but nothing that bothered me to much.

The music was great, the soundtrack fit really well on the scenes the were playing on and I could see myself listening to it on my spare time.

As for rewatch value, I always find it to go down a bit since you've already watched it... especially if the drama has a lot of twists. Zettai Reido does not really have any huge twists so I feel like you could watch this again after some time and still enjoy it to the fullest.

Overall it is a quite average drama, nothing to special but nowhere nere boring. It has it's moment, and I had no trouble binging the first season, so I would recommend this one to lovers of crime dramas ^^