Q.E.D. - Shoumei Shuuryou (Q.E.D. 証明終了) is a manga series by Motohiro Katou. It was serialized in Magazine E-no.
Touma Sou graduated from MIT, but he comes back to Japan because he wants to know how it feels to be a high school student. On the other hand, Mizuhara Kana is a strong girl who loves sports. Together, they are partners in solving cases that happen around them.