Asian Sea Merchants (アジアンシーの海商人 Ajianshī no Umi Shōnin?) is a 6 page mini chapter by Keitarō Takahashi that appears in the Black Lagoon art book Black Lagoon: The Book of Venom. It is a crossover between Jormungand and Black Lagoon. Both mangas ran in Sunday GX.
Revy meets a young Koko Hekmatyar who offers to sell her weapons. After she informs Dutch, Koko convinces her to take a look at what she has. Revy is surprised by the quality of the weapons and sees an additional box, which Koko offers to throw in for free. It includes MREs, figures from the Team America: World Police limited edition DVD box set, exercise equipment, and high end makeup. Koko convinces Revy to spend her prior month’s salary on makeup, which surprises Dutch back at Lagoon Company headquarters. He informs Revy that they do not give advances.
The chapter suggests that Black Lagoon and Jormungand occur in the same timeframe, as the former is set in the early to mid 1990s while the latter occurs in the late 2000s. However it is set in Asia, which is Kasper Hekmatyar's territory, not Koko's.