The opening themes are "Alones" by Aqua Timez, used for the first twelve episodes, and " After Dark" by Asian Kung-Fu Generation, used for the remaining episodes. The episodes use four pieces of theme music: two opening themes and two closing themes. A collection of the two volumes was released on December 12, 2011. Manga Entertainment released the first volume from the season on September 26, 2011, while the second one is due to October 17, 2011. Episodes 134–145 were released on Maas Viz's eighth compilation while the remaining ones were released on June 21, 2011. Episodes 132 and 133 were also released in Viz's seventh English DVD box on December 21, 2010. While Viz Media released a single DVD volume on Septemfeaturing the season's first episodes, the entire season has only been released within others DVDs. Five DVD compilations, each containing four episodes of the season, were released by Aniplex between Decemand Apin Japan. The English adaptation of the Bleach anime is licensed by Viz Media, and this arc began airing on Jand ended on Septemon Cartoon Network's Adult Swim in the United States. The season aired from July to December 2007. Although episodes focused on the character Ashido Kanō were not featured in the manga due to timing issues, Kubo still helped the anime staff to show them in the anime. The season follows Ichigo Kurosaki's journey to Hueco Mundo to rescue Orihime Inoue, who was kidnapped by the arrancar under the command of former Soul Reaper captain Sōsuke Aizen. The twenty episodes featured in the season are based on Tite Kubo's Bleach manga series. The episodes are directed by Noriyuki Abe, and produced by TV Tokyo, Dentsu and Studio Pierrot. In the English adaptation of the anime released by Viz Media, the title of the season is translated as The Hueco Mundo.
The seventh season of the Bleach anime series is named the Arrancar: The Hueco Mundo Sneak Entry arc ( 破面・虚圏 潜入篇, Arankaru Weko Mundo Sennyū Hen).