Kanojo wa Uso o Aishisugiteru(カノジョは嘘を愛しすぎてる)(English: The Liar and His Lover) is a Japanese manga series written and illustrated by Kotomi Aoki. As of 2013, it has over three million copies in circulation.
Aki is a genius musician, composing songs for a famous rock band (Crude Play) he was a member of before their debut. He is going through depression, never smiling, and trying to find comfort in humming. One day he accidentally meets high school student Riko, who falls in love with him at first sight, recognizing the pain in his humming and trying to help him overcome it. Aki deliberately lies to her about his identity, but when the same producer that scouted his band recruits Riko for her beautiful singing, the lies have to come to an end.