"Liar") is the tenth single by Japanese recording artist Aya Ueto.

[1] The title track was written and produced by singer-songwriter Tetsurō Oda, marking their fourth consecutive collaboration.

[1] The song speaks about honesty in a relationship, and how a simple lie can change everything.

[1] CDJournal described "Usotsuki" as a "bittersweet folk-pop song that pulls at the heartstrings of Japanese people.

"[2] "Usotsuki" marks Ueto's return to a darker image, reminiscent of her first two singles "Pureness" and "Kizuna".