Koihime Musou S01 E08 Kan'u Interrupts Kouchuu's Plot

At the tea house near the mountain's ridge, a young lady is entangled with a bad guy when Kanu enters to help. During the course of events, Kanu ends up paying this lady's check. Her name was Sonshoko and she promised to repay her so she declared to be the servant of Kanu and her friends.