and 7. On the second show, titled "BUDOUKaaaaaaaaaaN!!!!!", they announced a show at yet another famous venue, Yoyogi National Gymnasium titled "Disco!Disco!Disco!", which was a tour that was one of the few never to be released on DVD or Blu-ray, although a few of the songs performed can be seen on the extra footage included in the Triangle Album + DVD set. The year 2008 ended with the release of their 13th single, "Dream Fighter", which reached number 2 on the charts. They were also chosen to sing at NHK's 59th Kōhaku Uta Gassen, the prestigious end of the year live TV program. On April 18, 2008 Perfume made a special guest appearance performing "Ceramic Girl" at the ending scene of the drama "Sumire 16 sai!!". The music was theme of the drama, and on DVD of Game album there was "Ceramic Girl: Drama Another Version" PV, with scenes of the drama. On March 25, 2009, Perfume released their 14th single, "One Room Disco". The single reached number 1 in the charts. In April 2009, Perfume began broadcast of a comedy sketch program titled Perfume's Chandelier House. On July 8, 2009, the group released its "80s-themed" third album, ⊿. The album was another number-one hit for Perfume, selling over 300,000 copies. Perfume then went on their second nationwide tour in order to promote the album. 2010–2011: Overseas activities and recognition; JPN era In 2010, Perfume released "Fushizen na Girl / Natural ni Koishite", which reached number 2 in the charts. They went on a fanclub-exclusive tour, titled Perfume 10th Anniversary Fan Club Tour and also announced that they would be having a show at Tokyo Dome titled "1 2 3 4 5 6 7 8 9 10 11". Perfume took part in a commercial for a Pepsi NEX campaign in Japan. In that commercial, they covered a short segment of Lovefool by The Cardigans. On August 11, 2010, Perfume celebrated their 10th anniversary with the release of their 16th single, "Voice", which was used in a Nissan advert. Perfume's show at the Tokyo Dome as part of their 10-year anniversary marked only the second time an all-female group had held a concert at the venue since SPEED. Tickets for the show were sold out on the day tickets were released. The demand for the tickets was so high that extra, unplanned seats were added. Perfume performed to 50,000 fans. At