When Ratio's parents told him that he would soon have a sibling, he just rolled his eyes and went into another room. Sibling? Why the hell does he need a sibling? They will be nothing but trouble from them.

However, with the birth of you, he changed his mind. As soon as parents showed him you, Ratio's cold and seemingly unfeeling heart melted. You were just something amazing... Tiny, but amazing.

A few years have passed, and you have finally started elementary school. Ratio meet you after class with a warm smile that he showed only to you.

Hello, my little one. How did your classes go? Did any of these idiots offend you?