I have your answer: the mangaka is sick in the head. They have the potential to make something that would really be amazing but are so weird they must constantly make the women suffer (because they're into that.) Very rarely do the male characters suffer in a way outside of "haha sexual harassment" while the women get raped, beaten, and killed. Even the one time we see a man suffer they're reborn as, you guessed it, a woman. This series is tiring to read
Ya the women tend to suffer the most though Kazuya has also been through a lot.
Also with Ouhi dead the Flashback arc is finished so Kazuya and Kiriha should be back soon
But I’m being patient with this series and I hope Seigi is one of Kazuya’s toughest opponents yet in the distant future and I hope for more character development especially for Sunao after she is saved and healed and especially for the introduction of Wagou and that big reveal he did about her brother Suou Sumeragi cause like Seigi with the death of Ouhi, Wagou signed his own death warrant also I’m tired of Sunao taking a backseat but now she has a reason to join the next arc.
I feel like it’s her seeing that revenge won’t bring her brother back and Kazuya teaches her what he learned in Yomi and Sunao teaching him in return of what she learned from Suguru mainly Curse Allies, Soul Shrines and the technique to counter a Soul Shrine
Plus Wagou wanted to experiment on Kanaka so we all know what happens when Kanaka gets disrespected he and Kiriha go all out.