Soredemo Ashita mo Kareshi ga Ii is not a romance. It’s a horror manga dressed in shoujo clothes —the horror of settling, of low self-worth disguised as pragmatism, of knowing you deserve more but being too exhausted to go get it.
No one is a clear villain. The protagonist’s boyfriend isn't necessarily "bad," but the friction between their personalities is portrayed with painful accuracy.
A character who approaches Kouhei with a purity that, in the context of the series' "immoral" themes, can be both "cruel and sensual". Themes of Immorality and Emotion
それでも明日も彼氏がいい (1-4巻 最新刊) - world-manga10
To give you a sense of where this manga fits in the ecosystem, consider these comparisons: