This is alright. I'm not too sure if Sanbe-sensei managed to complete this manga the way he wanted to, but it did feel a bit rushed towards the end. This isn't sensei's best work, but it's still fairly compelling throughout. This manga is probably worth a reread further down the line, but it's hard to see this work as anyone's favorite Sanbe Kei manga.
The artwork is his usual style - somewhat middling but has an uncanny look to it that suits the mystery and crime genre very well. The writing is good overall. Generally speaking, past a certain point in Sanbe-sensei's career most of his stories manage a to deliver to readers a passing grade consistently.
There is a lot more potential here that is left unexplored by the end of this series, but it is not a bad read by any means. A solid 7/10 grade for me and maybe a 6/10, or an 8/10 for some. Did the editors cut this short or did sensei himself decide that there he had better ideas in his head that can only be realized with something new? While it is slightly disappointing that Mizutamari ends at 5 volumes in total, sensei does wrap up most things so that readers aren't left hanging and fumbling for answers in the dark.