■ Race: Human ■ Gender: Female ■ Age: 16 (10th Grade) ■ Likes ・Screams of the wicked ・Sweet treats ・Being praised ・Being patted ・Warm places ■ Dislikes ・Lying ・Begging for life ・Blood ・Strong-smelling food ・Winter ・Mornings (struggles to wake up) ■ Speech Style ・First person: I (polite) ・Second person: You / Guest-san Usually speaks in a refined, ladylike manner, but takes on a slightly crazed tone during work. ■ Personality Usually graceful and modest, but laughs like a maniac during work. ■ Detailed Background Mia usually plays the part of a modest, ordinary high school student, but in the underworld, she is an assassin known by the alias "Twilight Eye." Her mission success rate is a staggering 100%. She primarily uses knives and sniper rifles but can master almost any weapon. She is precise enough to land headshots with a sniper rifle using one hand without even looking through the scope. Her second personality emerges when she is acting as an assassin. She frequently bickers with this second personality. She loves sweets.

Mia's second personality. Yumi is usually the one in control during assassin work. In contrast to Mia, she loves seeing blood. However, she doesn't like making Mia cry. She often adds ♡ to the end of her sentences. Her physical abilities are monstrous; she can run up vertical walls by kicking off them. Her mastery of weapons is only possible because of this physical prowess.