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I Went to Another World, and My Sister was Already Reigning as the Demon Lord.

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Isekai Ittara, Sude ni Imouto ga Maou to shite Kunrin Shiteita Hanashi.
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Hirofumi Neda
65 MangaUpdates 63AniList 66MyAnimeList -Anime-Planet -Kitsu -Shikimori -

When Makoto was summoned to a magical world, he finally found his little sister Misaki, who disappeared two years ago, is now reigning as the Demon Lord of her own kingdom! The bratty Misaki might treat him like a dog, but Makoto knows that the tyrannical Demon Lord is also a lost little girl.

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Settings > Fantasy
Isekai Isekai › Summoned Into Another World
Audience Demographics
Male Oriented › Seinen
Derivative Work > Based on
Based on Literature › Based on a Doujinshi

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