One of the "Noble Sisters" from St. Gloriana's Girls Academy. She is a third year. Her role is a commander in the Churchill tank. As the commanding officer at St. Gloriana, she leads the entire Panzer team. Her characteristic is the way she speaks in a high-handed manner. She is calm, chivalrous, and maintains her composure in and out of the field. Her motto is "No matter how fast we go, or no matter how many hits we take, I will never spill my tea." She is seen most of the time drinking Darjeeling tea.
Her name refers to a common tea blend which is commonly called "Black Tea" in English or "Oolong" in Chinese.