and Shingo.S with production handled by Sakazume MisakIt, it was released as her 17th physical single through Sony Music Japan on May 18, 2005.

The single is supported with the B-side tracks "Love It Take It" and "Bet You Don't Know (English ver.

)"; the latter track was originally included as part of her previous album Crystal Style (2005).

It was certified five times by the Recording Industry Association of Japan (RIAJ) in different categories, including double platinum for digital sales, million in chaku-uta (ringtone), platinum in physical shipments, and gold in streaming.

The music video for "Koi ni Ochitara" features Crystal singing at the Roppongi Hills Mori Tower.