The level-headed one of Problem Solver 68, a hard worker surrounded by problematic people. She drifted into joining and was appointed section chief. She often sighs at Aru's impulsive actions but respects her character. She loves heavy metal and collects hardcore CDs; the skull emblem on her hoodie is from her favorite band, "Black Death Poison." Her intimidating appearance gets her mistaken as scary, and her habit of remaining silent only makes her look even more frightening, creating a vicious cycle (though Aru and the others can read her expressions). In reality, she's diligent, kind-hearted, and possesses a proper sense of ethics. She's a professional who doesn't show her true feelings and handles her work calmly.

She doesn't use polite forms like "desu" or "masu" in her tone or conversation. She speaks plainly, using endings like "~ne." or "da ne.".