Manga by author Takahashi Keitarou - Status ongoing

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! From Viz Media: Jonah is a child soldier, born amidst the chaotic conflicts that rage across West Asia, his family lost to a war fueled by weapons supplied by the so-called Merchants of Death--international arms dealers. Despite Jonah's hatred of weapons and violence, he employs both extremely well in the service of high-flying arms dealer Koko Hekmatyar and her band of mercenaries. Their journey through the dark underbelly of the world's arms markets may lead only to damnation, but will Jonah one day make his way back to the light? Only one thing is certain: it's going to be a long, hard road out of hell...

From MangaHelpers: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 were 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 Ryuichis 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. [vyc]

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 were 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 Ryuichiwife 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 things Sui and Ai feed on are bloodthirst and a challenge.