Yane no Shita no Artemis

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A prodigy of science and a solitary genius—yet terrible at so many things!? Poor university student Sanosuke Saraki unexpectedly reunites with his admired genius classmate, Koharu Kobachi, at his part-time job back at his old school. However, this supposed genius is now a "5th year high school student" who has repeated her second year in a row...! Saraki's mission is to "make Koharu graduate by the end of the year."