Watashi ga Oneechan Nan Dakara ne!

A 15-year-old high school freshman named Takatsuki Misora struggles with her short stature, which often leads others to mistake her for a younger child. Her peers tease her playfully, adding to her self-consciousness. The situation becomes more complicated due to her 11-year-old sister, Kotori, who appears much older and frequently engages in behavior that makes it seem as though the roles of the siblings are reversed. Kotori adores her older sister and wants to spend time with her, but Misora feels embarrassed by the perceived reversal of their sibling dynamic.