Takahashi Keitarou

Appears in the Black Lagoon art book Black Lagoon: The Book of Venom. It is a crossover between Jormungand and Black Lagoon. Revy meets a young Koko Hekmatyar who offers to sell her weapons.

Shiragaki Seiya, a high school student and the daughter of a mangaka, is anxious to become financially independent so as to relieve the burden on her single mother. One day while on the way to school, she has an encounter with "The Spirit of the Chest, Aurelia de Medici," and thereafter finds herself thrown headfirst into a no-holds-barred otherworldly battle revolving around money.

Billionaire Tono Ryuichi, the President of Tono Foods Group, a giant food company, recently acquired two young female assassins from the Mexican cartel. Sui and Ai came from unimaginably poor childhoods and was given a choice between killing people or selling their body. They chose the former and went through an inconceivably extreme training and, at 17 years old, they have become one of the deadliest assassins in the world. They are absolutely obedient to their master and they are given the task of finding the killer that poisoned Ryuichi's wife and child. They begin attending high school to blend into society and, at the same time, read and study which helps them become even more deadlier on the field. Sui and Ai encounter Matoba Imari who is a high school assassin herself and may be more skilled than both of them. But unlike the two, Imari just wants to lead a normal life. Whatever Imari wishes for her life is not their problem because the only thing Sui and Ai feeds on are bloodthirst and a challenge.

This manga revolves around an underground weapon seller and her accomplices. The story starts when they add a new member to her team, a quiet young and strange boy. He hates weapons. An intense action-packed series with bullets, knives, words, and blood flying everywhere!

Imari Matoba looks to be an ordinary, physically-weak high-school student. But this quiet, nondescript girl is actually an assassin - a top gunfighter with unlimited potential who can take down several armed men at once…

This volume contains graphic violence, strong language, nudity, adult situations, drinking', smokin', ass-kicking, law breakin', gun-love, running with scissors and just about everything your mother ever told you not to do.