Akaashi Keiji × Oc (On hiatus) Kuroko Sierra is Kuroko tetsuya's twin sister. She goes to fukurōdani academy. Where she plays vollyball and basketball, she is also the captain of both the teams because of her leader ship qualities. You can't say that Sierra is a prodigy because at first when she started playing the sports she really sucked at it. But you know what they say hard work pays off. By the way did I mention that she is also a First year and the cousin of our one and only milk loving setter, kageyama . Lets see how much mess can the first year captain's life can be. I do not own knb or haikyuu I also do not own any of the images that are used in this story. If I do then I will mention it English is not my first language so I apologies if there are any grammar or spelling mistakes.