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I feel like the fact that yumi never showed kanchan how he was hurting made kanchan even more violent. Im not at all saying that yumi deserved the abuse or that it was his own fault, i just think that both of their issues combined led to that big escalation. Because kanchan is not a bad person and he knew that he was hurting yumi but yumi himself always came back to him and tried to keep the relationship alive (if you've read azami) and kanchan couldnt resist which led to him loathing himself even more, which again lead to yumi getting abused more. I really like the psychological backgrounds of this series. Its great of the author to give them all a happy ending, they truly deserved it