Constellation:

Character:

The To strategist and Yue's best friend from childhood. She becomes irritated when Yue opens up to Kazuto, but cannot say no to her. She has some interest in Kazuto, but is always too angry and proud to show it. It is later shown that her harshness is mostly a result from her forgetting own happiness to devote herself to protect Yue.

Source from Wikipeida