What a trainwreck of feelings that give you this manga in no time. From 0 to 100 in an instant, in that aspect, reminds me to Ijima Yabai Yatsu, it's not about the violence, the raw atmosphere or the torture, it's all about the suspense and the impact that can give you the scenes and the interaction between the couple, i can't say it's a unique manga, but it's well written.
Tbh, that's what I was expecting when I started to read Yozakura Family years ago, a pair of lovebirds fighting for their love in a pretty fucked up dark world.