Mika, the head maid of Kawarazaki Manor with violet hair and purple eyes, works directly under Nawatsuna alongside the butler Inagaki. Her primary duty involves managing the manor's household operations while secretly advancing Nawatsuna's schemes to trap visitors. Mika actively maintains the mansion's facade of normalcy, ensuring guests remain oblivious to the disturbing activities hidden within. She plays a direct role in suppressing attempts to expose the manor's secrets, such as swiftly intervening with Inagaki to subdue Yuuma after he prematurely discovers Nawatsuna's torture chamber. This breach forces them to accelerate their plans. Mika also orchestrates the sabotage of escape efforts, including engineering car breakdowns to prevent guests from leaving, thereby reinforcing the manor's control and contributing to the psychological and physical entrapment of its inhabitants.