Rena Arisugawa

有栖川 レナ
A young woman who is a Jinki user. She is depicted as a quiet and serious person who is focused on her job who frequently takes the lead when fighting Kanshus. Her Jinki is Shingetsu a pair of chakrams with a triggerlike grip that allows the four blades of each Shingetsu to spin. After Youheis death she becomes Rikus partner and after they meet the Source of Infection she appears to become attracted to him. Later it is revealed she is a lost rebound victim. Source: Wikipedia