Oricon weekly single charts. Mizuki won the "Best Musical Performance" award by her song "Justice to Believe" in the first Seiyu Awards in 2007. Since her seventh album Ultimate Diamond debuted at the No. 1 position on Oricon weekly album charts during the week of June 15, 2009, she became the first voice actress to reach the No. 1 position on the Oricon weekly album or single charts since its creation in 1968. Ultimate Diamond sold over 74,000 copies in the first week. In addition, her 21st single, "Phantom Minds", became the first voice actress single to top the charts, debuting at the No. 1 position on the issue of Oricon weekly single charts dated January 25, 2010. On November 23, 2009, NHK announced that Mizuki would take part in the 60th NHK Kōhaku Uta Gassen of New Year's Eve. It was Mizuki's first time appearing on the show. Nana chose her song "Shin'ai" for her performance. She is well known for voicing female characters who are very shy yet kind-hearted and gentle, and many of the characters she has voiced were initially very shy/soft-spoken (however, after interactions with other people, they gradually opened up (e.g. Fate Testarossa from Magical Girl Lyrical Nanoha, Nyamo from Love Hina, Hinata Hyūga from Naruto, Wrath from Fullmetal Alchemist (2003) and Tsubomi Hanasaki from Heartcatch Precure!). She's also well known for voicing females with romantic affection for protagonists, as six of her characters have romantic feelings for the main characters (Oboro from Basilisk, Hinata Hyūga from Naruto, Colette Brunel from Tales of Symphonia, Tamao Tamamura from Shaman King, Moka Akashiya from Rosario + Vampire and Fate Testarossa from Magical Girl Lyrical Nanoha), some of her characters craved maternal attention (e.g. Fate Testarossa from Magical Girl Lyrical Nanoha and its sequels A's and StrikerS, Wrath and Maria) and she was also part of the voice actress quartet "Prits", alongside Yumiko Kobayashi, Natsuko Kuwatani and Hisayo Mochizuki (all four voiced characters in the anime Sister Princess). Nana Mizuki voices Microsoft's Japanese Windows 7 unofficial "OS-tan" mascot, Nanami Madobe. The mascot's name uses some wordplay on Mizuki's own name as well as the operating system ("Nana" = "seven"). In the middle of February 2010, Mizuki was named her hometown (Niihama, Ehime)'s First Tourism Ambassador. The news was broadcast during her Live Academy 2010 tour, held in Kanagawa, Osaka, Aichi, Miyagi, Fukuoka, Ehime Prefecture Niihama Cultural Center's Hall.