Mina serves as the head maid of Kawarazaki Manor, directly under Nawatsuna. Alongside the butler Inagaki, she oversees the mansion's operations and rigorously enforces Nawatsuna's authority. Her duties extend to active participation in the psychological manipulation and confinement of guests. When Yuuma prematurely uncovers hidden aspects of the mansion, Mina and Inagaki intervene to subdue him. They explicitly acknowledge that his early investigations forced them to accelerate their plans rather than maintain appearances longer, confirming her direct involvement in the manor's torture and imprisonment schemes. Mina consistently acts as an antagonist within the time loop narrative, upholding its distorted reality.