I Became My Idol's Sister, so I'll Be a Villainess to Keep My Brother

Oshi no Imouto ni Tensei shiteshimatta node, Saikyou no Akujo ni Natte Oniisama wo Dokusen suru Koto ni Itashimasu
推しの妹に転生してしまったので、最凶の悪女になってお兄様を独占することにいたします
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