Coincidentally, they both are from 1996. Though, the Battle Royale-novel was only finished in 1996, while Kaijis first chapter was released in 1996. So maybe they had the same inspiration, or somehow the novel was influenced by the Manga, even though it was so early in its fame.
In 1996, times were tough after sudden and dramatic burst of the great Japanese real estate bubble. Multi-year recessions, mass layoffs, people turning to sketchy hustles to make side income.
Kind of mirrors what's going on in many countries.
Coincidentally, they both are from 1996. Though, the Battle Royale-novel was only finished in 1996, while Kaijis first chapter was released in 1996. So maybe they had the same inspiration, or somehow the novel was influenced by the Manga, even though it was so early in its fame.