A calm, dignified young woman of sound mind and peak physical fitness. Kirumi made a name for herself while working as a part-time maid, earning a reputation for fulfilling to perfection any request made of her. However, she refuses all requests made by corrupt individuals.

As a maid, Kirumi embodies the philosophy of selfless devotion. Even while trapped in the Ultimate Academy, she continues to serve her classmates almost on instinct, such as by preparing meals and doing chores.