You will be presented a mystery.
You will see images, meant to disturb and intrigue you.
The story will develop, but not the characters. The sad remain sad. and the helpless remain helpless.
As a result, you might not care much for the characters at all.
You just want a happy end so you can get on with your life with a sense of closure on this story.
You don't get it.
The mystery will be explained. Poorly.
The (entity?) that carried the plot will not be laid to rest.
The cycle goes on.
Why? Who knows?

In a nutshell, if you like satisfying conclusions and well-explained mysteries, stay away from this manga for it will provide you with neither.