The male protagonist is a "memory detective" who has the ability to read fragments of recent memories by touching objects or people (similar to "Sherlock" but more specific). He opened a firm that specializes in solving "memory mysteries" that the police cannot solve. But he has the side effect of "memory overload" and needs to regularly "clean up" useless memories, otherwise he will suffer a mental breakdown.
The female protagonist is the only one whose memory the male protagonist cannot read. Her memory seems to be "encrypted" or "shielded", and it is a "blank" in the eyes of the male protagonist. What's even stranger is that she seems to have a "purifying" effect on the male protagonist's memory ability and can relieve his overload pain. The identity of the heroine is a mystery. She claims to be an ordinary office worker, but her behavior occasionally reveals something unusual.
Concept: Memory Detective