In 2001, on March 14, Gackt released his eighth single, "Kimi no Tame ni Dekiru Koto", which peaked at number six, and charted for 18 weeks, Gackt's longest-charted single until 2009. On April 25, the second studio album, "Rebirth" was released. It was Gackt's first concept album, conceived around a fictional narrative during the time of World War II, named "Requiem et Reminiscence". The album includes previously released singles "Seki-Ray" and "Secret Garden". It peaked at number three, spent 21 weeks on the charts. On May 3, Gackt went on the "Requiem et Reminiscence" tour, which included 18 concerts at fourteen venues. The final concert was held on June 23 at the Yokohama Arena. His ninth single, "Another World" was released on September 5. It was Gackt's first single to reach number two spot on the charts, spent 17 weeks on them, and managed to sell over two hundred and fifty thousand copies. After the events of September 11th, 2001, in New York, Gackt wrote a song for a world peace. It was released December 2001 as a single, "Jūnigatsu no Love Song". It peaked at number five and charted for nine weeks. From 2001 to 2004, the single was recorded in Japanese, English, Korean and Chinese, which were all released before Christmas. On New Year's Eve, Gackt performed "Another World" for the first time at the annual music show, the 52nd "Kōhaku Uta Gassen".