episodes 26 to 41. The single debuted at number 9 on the Oricon chart, her second single to debut in the top ten. Just under two months after "Motherland", Crystal Kay released her first compilation album, CK5, which was released on June 30, 2004, featuring a selection of tracks from Crystal Kay's four previous studio albums, as well as her latest single, "Motherland". The album celebrates Crystal Kay's fifth anniversary since the release of her debut single "Eternal Memories" in 1999, hence the title. CK5 peaked at number 2 on the weekly chart and charted for 49 weeks, eventually being certified platinum by RIAJ. Another single, "Bye My Darling!" was released on November 17, and peaked at number 40 on the Oricon chart. It was Crystal Kay's final release of 2004. The single "Kiss" started off 2005 for Crystal Kay. It was released on January 26, 2005, and peaked at number 10 on the Oricon chart. The single had longevity at eventually became her second best-selling single. "Kiss" was the CM song for NTT DoCoMo "Music Porter". "Kiss" was written by the same songwriter of the ballad "Yuki no Hana" by Mika Nakashima. Crystal Kay's fifth studio album, Crystal Style followed two months later on March 2, 2005. The album debuted at number 2 and sold 296,756 copies. The album was the 44th best-selling album of 2005 in Japan. Crystal Kay released her seventeenth single, "Koi ni Ochitara", on May 18, 2005, which was used as the theme song for the drama Koi ni Ochitara: Boku no Seikō no Himitsu. The single is currently the best-selling single of her career, selling 295,456 copies, and Crystal Kay has sai that it changed the focus of her career away from R&B and towards J-Pop. In its first week it sold 73,717 copies, in its second week it dropped to number 4 and sold 51,546 copies, and in the third week it fell one place to number 5, selling a further 38,302 copies. Crystal Kay's next single was a collaboration with the R&B duo Chemistry called "Two as One". The single was released on October 5, 2005, and peaked at number 2 on the Oricon charts, much like "Koi ni Ochitara" earlier that year. "Two as One" was released as Crystal Kay × Chemistry. On February 8, 2006, Crystal Kay released "Kirakuni" / "Together", her nineteenth single and the second A-side to be