Mobile game, Ikemen Sengoku, will have an anime adaptation in 2017. In the game, the protagonist goes back to the Sengoku era where she can play up to 11 historical figures. All characters will appear in the anime but the format is yet to be announced. From ANN and MAL.
Here's the latest PV from Marginal #4. This will be my last post since it looks like it's not going to be a reverse harem without any sign of heroine. More info on ANN.