He's 17 years old, but his birth date and place are unknown. Mitsuru, unlike the rest of the Moonlight Bandits, had been raised by humans. When the humans betrayed him, he vowed that he would one day kill the entire human race. He wandered through Japan for years, and it was only until he was 16 that he met and became one of the Moonlight Bandits. Because he grew up with humans, he has no idea what his clan's weaknesses are and is not used to his transformation. Until he learns to control his power, Mitsuru transforms every time he touches Mahiru, or vice versa. Along with this transformation comes an uncontrollable surge of anger.