Shochi na Onee-chan de Gomenasai!

Akira Homma, a first-year junior high school student, has a sister he loves very much. She is beautiful, kind, and smart, the perfect older sister. But when it comes to books, she becomes so absorbed that she loses track of what's going on around her. An exciting reading comedy about an innocent younger brother and an oblivious older sister!

(Source: Takeshobo, translated)