Allow me to quickly explain to you the failure of this series.
1st is the length of the series. 22 chapters, no need to explain further. You won't create a good story in such a short time, especially a good romance story. The chapters are quite short, usually around 15 pages on average per chapter.
2nd is the plot, our main heroine Eri got hit by a train and woke up in the medieval country of Brittania. Apparently, a witch took away all the females and Eri has to defeat this witch with the help of handsome knights? Or lead the people of Brittania to defeat the witch? I guess the original plan was to fight the witch, but it seems the series didn't get enough popularity or support, so the author rewrote the plot around chapter 6 to transform this series into a short political romance drama. Now, there are 5 females from the modern era located in Britannia. For the rest of the series, the characters engaged in various plots to gain power, find out who's the real Slim Shady and get rid of each other or to romance each other.
What about the witch? She never appeared in the manga. This plotline never progressed beyond the larval stage.
3rd are the missing females. Why? Just why? It's stupid. Britannia Lumiere quickly turned into a romantic mess with a few weird rape attempts. Why did you remove all the females in Britannia for this Walmart Twilight in the first place? Oh, I know why...
4th is Shuumatsu no Harem brand. If you exclude the lack of a female population, this series has exactly zero connection to the original series. There are no similarities in terms of plot or characters.
Britannia characters are mediocre at best, Eri is an alright heroine I guess. You can only do that much with 22 chapters.
3/10. I do not recommend Britannia Lumiere. Avoid this series, it is not worth your time. Britannia turned out as an attempt to milk the Shuumatsu no Harem brand.
