Sprinter wa Nemurenai
スプリンターは眠れない
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-Description
Akane and Aoi are siblings, 11 months apart in age. Although Aoi is a siscon, he is still better than Akane in track and field... The one who comforts her frustration at being overtaken by her brother is Kamiwazumi-kun, who is famously quiet! (Source: Akita Shoten, translated)