This is pretty interesting, and I do like a lot of weird shit. However, there's something about infidelity that just pisses me off. I think it may be how polarizing and real it is. I can read a lot of other manga, but when manga talk about infidelity, it just grinds my gears.
It makes me not like the protagonist outright. I understand her motives and reasons for sleeping with a married man, but it doesn't make her less scummy for me. The man is, of course, more of a piece of crap for being married and cheating.
This will make it hard for me to feel for her pain and root for her victories, but maybe the author can change my mind. With good character development and plot, it's made me sympathize and even like detestable characters before. Maybe I'll give it a chance.