Battle Tendency (Japanese: 戦闘潮流, Hepburn: Sentō Chōryū) is the second story arc of the manga series JoJo's Bizarre Adventure written and illustrated by Hirohiko Araki. It was serialized for around 1+1⁄2 years in Shueisha's Weekly Shōnen Jump from November 2, 1987, to March 27, 1989, for 69 chapters, which were later collected into seven tankōbon volumes. In its original publication, it was referred to as JoJo's Bizarre Adventure Part 2 Joseph Joestar: His Proud Lineage (ジョジョの奇妙な冒険 第二部 ジョセフ・ジョースター —その誇り高き血統, JoJo no Kimyō na Bōken Dai Ni Bu Josefu Jōsutā Sono Hokoritakaki Kettō). The arc was preceded by Phantom Blood (1987) and followed by Stardust Crusaders (1989–1992).
Set in North America and Europe in 1938–39 around 50 years after Phantom Blood, the story follows Joseph Joestar and Caesar Anthonio Zeppeli, descendants of Jonathan Joestar and Will A. Zeppeli from Phantom Blood who can manipulate sunlight-based energy called Hamon. Along with the Hamon master Lisa Lisa, Joseph and Caesar seek to prevent ancient humanoids called the Pillar Men, who invented the stone masks from Phantom Blood, from obtaining a powerful stone called the Super Aja, which would evolve them into ultimate beings and conquer their vulnerability to sunlight.
In 2012, Battle Tendency was digitally colored and released as digital downloads for smartphones and tablet computers. A four-volume re-release under the title JoJonium was published in 2014. This version was licensed and released in North America by Viz Media in 2015 and 2016.Battle Tendency was adapted as part of the first season of David Production's 2012 anime television series JoJo's Bizarre Adventure.
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