In the Dark Moon Sword, the status of Ester and Restia is actually quite peculiar.
According to the seniority ranking system familiar to the girls, commonly used by the Japanese, Fang Zheng is the founder of the Dark Moon Sword, while Ester and Restia are considered seasoned leaders at Level One. In this hierarchy, if Fang Zheng is not present, usually either Ester or Restia would be responsible for handling his affairs.
However, this is not the case. These two are like silent protagonists, always quietly doing their own things. When Fang Zheng is around, they fight alongside him. When he's not, they mostly stay in their rooms, and occasionally, everyone might see Ester and Restia going out to fight, but that's about it.
As for the guild's affairs, the two of them do not get involved at all, leaving it entirely to others as handed over by Fang Zheng.