Crystal Kay released her second compilation album, entitled Best of Crystal Kay. The collection featured over thirty tracks from her discography. Best of Crystal Kay was also released with a "limited edition" disc containing four new songs, including "Step by Step", produced by Yasutaka Nakata of Capsule. It was used as the theme song for "Janguru Taitei" which aired from September 5, 2009. Another new song, entitled "Over and Over" will also be in the CD. It is currently used in a commercial for NTT's "Live On FLET'S". Crystal Kay did not star in this advert. "Over and Over" was produced by Taku Takahashi of M-Flo. The fourth track "Helpless Night" is a collaboration between Crystal Kay and Jin Akanishi of KAT-TUN and is performed almost entirely in English. The collection debuted at number 2 on the Oricon Daily Chart, and sold almost 30,000 copies that day alone, and ultimately dropped to number 3 on the Weekly Chart, behind Superfly's Box Emotions and the second week sales of Arashi's All the Best! 1999–2009. It sold 87,669 copies that week. This is Crystal Kay's best peak position on the Oricon Chart since All Yours in 2007, as well as her best first week sales since Call Me Miss... in 2006. Crystal Kay finished off the year by releasing her first remix album The Best Remixes of CK on December 16, 2006. In 2010, Crystal Kay starred in her first role in a drama series. She played the character of Kokusho Akira, a genius hacker who has carried out many crimes all over the world in the Nippon Television drama Hidarime Tantei Eye, which stars Hey! Say! JUMP member Ryosuke Yamada. The drama began airing on January 23, 2010. On February 24, Crystal Kay released a brand new song, "Flash" on Recochoku Chaku-Uta. "Flash" was featured in the commercial for Canon IXY Digital cameras, which began airing on February 19. Crystal Kay also released a new song called "Victoria". It was being used as the commercial song for Tully's Coffee. Both of these new songs were featured in Crystal Kay's second mini album Flash, which was released on June 16. The mini album also included a tribute to Michael Jackson, and a song written by herself. She also released Crystal Kay Live In NHK Hall: 10th Anniversary Tour CK10 on the same day. It will be her first concert DVD. On June