His next series, "Bleach", about a high school student who becomes a "shinigami" and fights creatures known as Hollows, began running in the same magazine in 2001. Kubo initially expected the series' serialization to continue no longer than five years. The original story concept was submitted to "Weekly Shōnen Jump" shortly after the cancellation of "Zombiepowder", but was rejected. Akira Toriyama, creator of "Dragon Ball", saw the story and wrote a letter of encouragement to Kubo. "Bleach" ran for 15 years of serialization and reached over 698 chapters from 2001 to 2016. Additionally, an anime adaptation of the series was broadcast in TV Tokyo for 8 years from 2004 to 2012, spanning over 366 episodes. The manga was named a winner of the Shogakukan Manga Award for its category in 2004. Kubo and Makoto Matsubara have co-authored two novelizations of the "Bleach" series, which were published by Shueisha under their "Jump Books" label. The first was released in Japan on December 16, 2006, followed by a on December 22, 2007, a on December 13, 2008, and a on December 4, 2010. Kubo also appeared in the episode 112 of the Japanese radio program of "Bleach B-Station". In that program, Kubo was interviewed by Masakazu Morita, voice actor of Ichigo Kurosaki, the main character of "Bleach", and answered several questions from fans. On July 26, 2008, Kubo went to the United States for the first time and made an appearance at the San Diego Comic-Con International.