Chapter 8 of Mato Seihei no Slave features Kyouka rewarding Yuuki after a battle and hints at the mysterious girl’s connection to his past. As the 7th Squad encounters stronger, evolving threats, the characters' bonds and motivations continue to develop.
You can find in-depth discussions about the chapter on Reddit or read a detailed summary on the Mato Seihei no Slave Wiki . Mato Seihei no Slave Chapter 8 Raw