Following the globe-trotting JoJo's Bizarre Adventure Part III - Stardust Crusaders, Hirohiko Araki's series settled in Japan for Part IV: Diamond Is Unbreakable (or Diamond is Not Crash), running in Weekly Shōnen Jump from 1992 to 1995, collected in volumes 29-46 of the manga. The story revolved around Stand-related horrors and mysteries abound in Morioh, a town in S-City, M-Prefecture. Tweets suggest that the JoJo's anime producers might already be doing some location scouting in Sendai for after Stardust Crusaders ends this season.
When questioned on why the staff was in Sendai, posting photos of the iconic Aoba Castle, the response was "sorry, just a vacation."
@god_bless_yu すみません、観光です…。寺— TVアニメ『ジョジョの奇妙な冒険』公式 (@anime_jojo) May 9, 2015
Previously the staff responded to questions about a Part IV adaptation by saying that the production had not been greenit.
The cast were previously featured in the All-Star Battle game and a series of animated ads (voiced by Wataru Hatano, Romi Park, Wataru Takagi , Hiroshi Kamiya, Kazunari Tanaka, Taiki Matsuno, Kappei Yamaguchi, and Rikiya Koyama).
Episode 42 screenings were also held in Sendai's Miyagi with leads Daisuke Ono and Unshou Ishizuka and director Naokatsu Tsuda, as well as Tokyo, Osaka, Nagoya, Fukuoka, Kyoto, and Hokkaido to promote Stardust Crusader's final phase.