Yane no Shita no Artemis

Synopsis:

A brilliant scientific prodigy and lone genius—yet surprisingly hopeless at many everyday things!? Struggling university student Sanosuke Saraki unexpectedly reunites with Koharu Kobachi, the genius classmate he once admired, while working part-time at his former high school. However, the girl once celebrated for her extraordinary intellect is now a fifth-year high school student, having repeated the same grade twice in a row. Tasked with an unusual challenge, Saraki’s new mission is clear: ensure that Koharu successfully graduates by the end of the school year.