Mozuku Kunato acts as a devoted subordinate and younger sister figure to Norio Kunato, demonstrating unwavering loyalty through constant vigilance over his needs and safety. She adheres strictly to his commands, even when cautioning against entering Ochiai's forbidden laboratory—an action she ultimately takes alongside him, disregarding her own warnings. Inside the laboratory, she suffers an assault resulting in infection by Ochiai's mind-controlling Blood Nematode virus. This infection triggers significant physical alterations: her previously long white hair shortens into a bob style, potentially due to decapitation during the attack. Her attire shifts from a formal black dress featuring a high ruffled neck to a functional black body suit. Under Ochiai's control, she transitions into a covert assistant role, functioning as the human pilot within the hybrid entity Tsumugi Shiraui. In this capacity, she exhibits awareness of Tsumugi's emotional states, notably approaching Nagate Tanikaze to convey Tsumugi's fondness for him.