Triage X OVA
Set nine years before the TV series, Yuko is out on a mission when she encounters a deadly enemy. Just as she makes her strike against her assailant, Yuko realizes everything is not as it seems. Hidden behind a mask and drug induced rage is a young Sayo. After narrowly surviving their fight, Sayo is still suffering from the trauma of her father’s experiments, but Yuko refuses to give up on her new patient.