Because they're a crazy serial killer, maybe?
My dear dude or dudette, just from the time she met Kazuki, MC, she murdered at least 8 people and a dog, and we got confirmed even more kills - previous brothers, their families and friends. She also tortured the guys. Idk if you wanted to be funny, but if not... We don't know her real story, I personally suspect she's some kind of ghost born out of malice, but, even if she was abused, it doesn't justify the shit she's done since then. She's unstable and dangerous, the worst mix. I have no empathy for these types of psychos.
"The antagonist did nothing wrong".. ?????? (⊙_⊙ )
i'm not sure but i think this is like most horror story that... not really creepy...
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this is good but the art is too beautiful it have no difference with another shoujo manga...
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and the antagonist, i think they dont do anything wrong at all... why main chara treat them like they're wrong? its weird... i'm sad for them ╥﹏╥