sentences:  She later goes hunting for Zesshin, getting acquainted with Daichi, who later becomes her apprentice, in the process.She learns during this mission that there is more to the human heart and mind than the color of their orbs within, from how Mutsuki's orb turns black while killing her peers trying to steal a spell allegedly to save her son, Daichi, and how the orb of her former master, Byakkai, stays white despite him being the one orchestrating the entire Zesshin incident.She goes against her code of breaking blackened orbs, and executes her former master by breaking his still-white orb, using the Soul Insertion spell.