ULTIMATE DIAMOND by 水樹奈々

Ultimate Diamond is the seventh studio album released by Japanese voice actress and pop singer Nana Mizuki on June 3, 2009. It was released in two editions: a CD only edition and a limited CD+DVD edition. The first press of the album has a 44-page booklet. A limited CD+DVD edition of the album included a DVD of a concert at the Shinjuku Koma Theater on October 11, 2008. At the concert, she covered two enka songs: Fuyumi Sakamoto's "Yozakura Oshichi" and Mitsuko Nakamura's "Kawachi Otoko Bushi". The limited DVD included the two songs. The album reached number 1 in Japan's Oricon weekly albums charts for the week of June 15, 2009, and became the first album from a voice actress to accomplish that feat since the creation of Oricon.