Here we go the 1st non-Preliminary review.

Tl;Dr don't care about the mean score given above (7.42) at the time of this review.
Give it a try.

I started reading this one some years ago. I read about 10 chapters then I put on hold as it was a good marathon material and it was still publishing, and everyone knows the pain of waiting for the next week chapter in a thriller manga, also chapters were about 6-10 pages so those who read it week by week ended up giving a low score....probably dropping it.

I was searching for a manga to read on my on-hold list some days ago and found it with "finished" status, so I gave it a chance and didn't regret it.

The story is thrilling as it takes place in a strange realm and there's always something new to discover about its mechanism every chapter. I was reading about 10-20 chapters/break time. also, there's plenty of twists in the plot.

The art is good and clean.

The characters vary.. irrational, logical, good, evil and unpredictable ones...So there's always a character to root for even if you didn't like the mc.

Really enjoyable series, you should give it a try.