"Joint", stylized as "JOINT", is the fifth maxi single by Japanese J-pop artist Mami Kawada, with both its A-side and B-side featured in her 2008 Savia album. It contains four tracks in both regular and instrumental versions and spans 17:40. Both its A-side and B-side tracks are featured as opening and ending themes for the second season of the anime series Shakugan no Shana. Geneon Entertainment released the single on October 31, 2007 in both a regular CD release and a limited CD and DVD that featured the music video for the track "Joint" bearing the catalog numbers GNCA-86 and GNCA-85 respectively.

Two years prior, Mami Kawada had written the single "Hishoku no Sora" (2005), her second most successful single, title track of which was featured as the opening theme to the first season of the anime adaptation of the light novel series Shakugan no Shana. In 2007, Kawada was pleased to be asked once more to write theme music for the upcoming second season of the anime adaptation entitled Shakugan no Shana II. Its story is focused around Yuji Sakai, an ordinary Japanese high school boy who inadvertently becomes involved in a perpetual war between forces of balance and imbalance in existence. In the process, he befriends the title character Shana, a female fighter for the balancing force, and one of his classmates named Kazumi Yoshida. During an interview, Kawada described Yuji as giving the impression of following behind Shana; however, during the second season, she described Yuji as giving off the same impression as Shana—the impression of walking together with Shana and actually providing her support during her battles.

Earlier in the year, Kawada had released her fourth single "Get My Way!" for the first season of the anime television series Hayate the Combat Butler. Up until her release of "Get My Way!", Kawada described herself as being bound by a set image of how she was meant to write and sing. After releasing her fourth single, she described having completely lost the image of how she would regularly sing. Before the release of her first two singles of the year 2007, "Akai Namida / Beehive" and "Get My Way!", she mentioned spending much time thinking, and during 2007, she began to slowly experimenting with different types of music. Thanks to this, she stated herself as being freed from image of how she was meant to perform. However, she noted it being ironic that despite the "Joint" being an experiment with this new style, she was returning for a third time to create music for Shakugan no Shana.

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