お姉ちゃんといっしょに異世界を支配して幸せな家庭を築きましょ? (Series) favorite_border

[DeepL Translation - needs review] Volume 1: "Will you go to another world and marry me?" I was in a panic at the sudden appearance of this beautiful, unknown girl, but it turns out that she was not proposing to me herself. It seems that she is a messenger, and that my missing sister has actually been reincarnated in another world and has come to deliver a message to me. She said, "Do you like my sister?　Then let's get married in another world, shall we?　I ruled a city for you." ...... Appar...