Japan is a manga written by Buronson and illustrated by Kentaro Miura.
Yuka Katsuragi, a beautiful TV news reporter, has attracted the affections of a Yakuza thug, Katsuji Yashima, who travels with his brother all the way to Spain to find her, only to have his affections rebuffed by Yuka. A terrible earthquake hits, and Katsuji, his brother, and Yuka, along with four high-schoolers in Spain on a field trip, all fall deep underground. While trapped below the surface, they encounter a mysterious old woman who reveals to them prophecies that the wealthy nation of Japan will meet the same demise as the once-prosperous city of Carthage. Katsuji and the others insult the old woman, who then sends them to see the world of the future with their own eyes, a future of desolation and death.