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What if the half-demon IunYasha had a little sister named Iunhasai and has another sword from her father's fang, the Tazen.
It's been 50 years since Kikyo had pinned InuYasha to a tree with one of her sacred arrows and 500 years later a high school girl named Kagome Higurashi fell down a magic well and into Feudal Japan. She released IunYasha, shattered the sacred Shikon Jewel and has to find it before any other demon. Therefore, InuYasha and Iunhasai haven't seen each other in a while.