Set in an alternate historical period, Oda Nobuna no Yabou is a historical comedy romance anime with a slight twist. The historical period that the anime is set in somewhat differs from real history and this is how the story gets interesting.
The historical romantic comedy follows 17-year-old high schooler Sagara Yoshiharu who one day time-travels to the Sengoku period, where all the major Samurai lords are cute girls. Yoshiharu meets Oda Nobuna, the female counterpart of Oda Nobunaga, and begins to serve her as a substitute of Kinoshita Tokichiro, who was killed.
To be honest, I am not really a fan of historical anime so I don't tend to watch those. However, with Oda Nobuna no Yabou it is a whole different story. Since the reviews were mostly positive, I decided to give it a go. I do not know anything about Japanese history (except the basics like the Shoguns and different provinces in the country) so I was pretty much guessing and learning as I sat through the series. However, the historical details int his anime is definitely fictional more or less (except for the names of people and places) so it did not impact on my viewing experience that greatly; but I would assume though that the anime would have been even more entertaining for people who know about Japanese history. That said, the story starts of with a high school guy named Sagara Yoshiharu that time-travels to the past (don't ask me why because the anime does not explain anything about it) where all the major Samurai lords are cute girls. You may think it's an instant harem right there, but the anime doesn't imply on it so you do have to use your imagination here. Of course though, Sagara doesn't go all overboard to turn this into an ecchi harem anime (which undoubtedly it isn't and it's not meant to be). So, after he is stuck in the past, he decides to use his knowledge about the future to try and change history as we know it (or not). The story gets quite exciting and engaging as we see the mutual love star to develop between Sagara Yoshiharu and Oda Nobuna, as well as his mission to protect her at all costs from awesome ninja assassins, betrayal of allied provinces, as well as building a castle in one night.