Chinese-American Moon (Luna) is a super genius girl who speaks eight languages. He is a detective in the Investigation Division of the Metropolitan Police Department, and lives under one roof with his bloodless brother, Yoichi, and cooperates in criminal investigations. The unusual way to spot Luna's criminal is that you can tell by looking at your face. By making full use of "viewing phase" and psychology, the truth of the case is vividly revealed from its face, facial expression, and gesture. The gesture of scratching the nose is evidence of lying. A fake facial expression (bad face) appears at the corners of the eyes. There are lots of psychological and observatory stories that you will want to refer to in your daily life and romance!
Tsundere of Tsundere (!) Luna and Detective Yoichi Heppoko. The smile of the two people who are not connected with blood, who are more than brothers and sisters and less than lovers (!?), Is also the heart of this work! It's a new sensation mystery that is a real story but cute! !!