Lock On! (ロックオン!) is a manga series by Kenta Tsuchida that was serialized in Weekly Shōnen Jump during 2010.
Utsuru Sanada is a professional photographer at the age of 17, he can guess the exact 3 sizes of any girl, he can memorize anything he sees, and he can counterattack karate moves (Most guys would want these abilities). Why? Because he has superb photographic memory called “Shutter Eye” (Shutter as in the shutter of a camera). He meets Niko Kurihara, the female protagonist, who dislikes men, is a master of martial arts, and is of course beautiful. As the story progresses, Niko at first thought he is an impure guy, but soon realizes he is unpredictable and not what he seems in her eyes.