Kotonoha was very insane towards the end of the story. Her words cannot be taken for objective evidence at all.
Actually I think Kotonoha was never normal after being raped. Her appearing normal at Christmas Eve was only because she got Makoto back, so she was in another berserk mode (the desire to keep Makoto aside, forever). She certainly turned into a monster after seeing Makoto again robbed away from her by Sekai (this time forever)......
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