"ILY (Yokubō)" (I.L.Y.～欲望～, "I Love You (Desire)") is Olivia's first solo single released on February 3, 1999, under the label Avex Trax.

[1] It peaked at 32nd place on the Oricon weekly singles chart and charted for four weeks.

[1] The single was used as an ending theme song in the TV show G Paradise, as well as in a commercial for Morinaga & Company.

[1] Her debut single marks a shift away from the upbeat dance-pop oriented music from her days in D&D to a more alternative rock sound.

[2][3] The music video was shot on January 17, 1999, at a studio in Japan.