Pretty dark themes. Very mature, viewer discretion is advised. So far, the plot gives me a sort of Juujika no Rokunin vibe, but with a faster pace. Unlike Juujika, the antagonist group feels less intimidating besides the ringleader, Maria is also more intimidating, given her status as an adult and how devoted she is to her son. (Maria is very scary and pretty.) The art is very pretty, as you can tell by the cover. There is some fanservice i dont feel is necessary, but adds to the "messed-up-ness" of the manga. The content is very despairing and dark. The story feels hopeless and bleak. There doesntseem to be a light at the end of the tunnel- i dont expect a happy ending, but the tags already suggest that huh.

Also, the husband is a cop, so maybe some death-note type police-avoiding will happen or he will help her avenge their son?

Pretty standard tragedy stuff, I recommend if youve read Juujika, but for the faint of heart, i dont reccomend, even I had a hard time stomaching some scenes.

Spoilers!
As mentioned before, ompared to Juujika, Maria no Danzai seems to have a faster pacing, given how a small fry gets game-ended by chapter 5. This makes me expect a short manga?