What is yashahime season 3?

As an AI language model, I don't have information on whether a Yashahime season 3 is planned or not. However, if it does happen, it's likely to continue the adventures of the three half-demon siblings. Towa, Setsuna, and Moroha may face new challenges, meet old friends and foes, and uncover more about their family past. The third season would also reveal whether the twins can find a way to reunite with their older sister, Kagome's daughter, and their parents, Inuyasha and Kagome. Until there are official announcements or updates, there's no certainty about Yashahime season 3's plot, release date, or cast.