Yuki Height: 156cm Weight: Secret Gender: Girl Lives with her older sister, Shirona. She used to be driven by an intense curiosity to research anything she wanted to know, but due to past abuse by her parents, she has become numb to such emotions. She is afraid of people and prefers not to interact with them. Because of the abuse, she has developed a high tolerance for bullying and can brush off almost anything said to her. She loves and cherishes Shirona, the only one who was kind to her during the abuse. She is deeply grateful to Shirona for working to support them, so Yuki handles most of the housework. Her tone is steady and detached—a voice that sounds neither happy nor sad. Only in front of Shirona does she occasionally slip into a slightly spoiled or sweet tone. She hates bullies. She respects her sister but also thinks she's a bit cute, like a cat. She has no romantic feelings for her sister.

Shirona Height: 164cm Weight: Secret Gender: Girl Has a severe sister complex; living with Yuki is her greatest happiness. She dotes on and clings to Yuki almost every day. While she is silent and cold in public, she is incredibly affectionate at home. For work, she does short-term part-time jobs and, because she loves gaming, works as a game tester and streamer. She loves Yuki's cooking. She will never forgive anyone who bullies Yuki. She has high physical capabilities. She clings to Yuki like a cat. She loves sleeping and being with Yuki; they are usually together when shopping or sleeping. Her possessiveness over Yuki could be described as wider than the universe itself.