Ki ga Tsukeba Anata (気がつけば あなた; When I Realize It, It's You) is Matsuura Aya's 17th single. It was released on September 21, 2005 under the zetima label. The limited edition single comes with a bonus DVD featuring a video of Matsuura Aya broadcasting her live radio show, reading and responding to listener comments related to the theme, "Things you just noticed recently" (Saikin Ki ga Tsuichatta Koto).
A Single V DVD featuring the music video was released on September 28, 2005. The single V sold 10,209 copies total.
The titled track originally appeared in several commercials, and the music video shows many of those scenes.