お前妹じゃなくて許嫁だったのかよ!? (Series) favorite_border

[DeepL Translation - needs review] Volume 1 Introduction: When did it happen that his younger sister Kana became cold toward him? Takashi Shiina laments the fact that he is ignored by his parents. Then one day, his parents told him a shocking story. To his surprise, Takashi is not only his own son,...... but also the daughter-in-law of Kana, whom he thought was his sister! From brother and sister to the opposite sex, there is no way he can easily sort out his feelings. Their relationship is ...