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Kakeru Komiyama is an average fifth-grader who can't stand his classmate, Ena Komiyama, despite sharing the same last name. She's smart, athletic, and everything he's not, which only fuels his frustration. When Ena suddenly transfers schools, Kakeru thinks he's free of her—until four years later, when they reunite at high school. Now, Ena is even more dazzling, and Kakeru's mixed feelings of irritation and admiration resurface. As their childhood rivalry reignites, unexpected emotions begin to bloom.