Human incqrnated into a different human looking species
SPOILER: from the novel Parents and the Queen dies, that princess dies... MC eventually forms a harem, witches lead a coup, witches becomes hunted down for that. Mc becomes a regent for his 5 day old daughter cause only females can inherit the throne???
So far, the beginning is nice. As this is a Japanese isekai manga, I don't really put hope that it won't be harem, since all Japanese isekai has a 90% chance of being one, I'll just wish for a very pleasant and interesting read.