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... Koko Hekmatyar, the head of H&C Logistic Incorporated, introduces new recruit Jonah to her team of troubleshooters, and it isn't long before they have some trouble to shoot. An Eastern European government official is holding up a shipment of aircraft parts that would shift the balance of power in the region. The trouble is, that shipment belongs to Koko, and she's not about to miss an opportunity to make a profit, even if it means two nations go to war.

(Source: VIZ Media)

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 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.

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.

(Source: MU)

Two assassins met - Imari Matoba, Yayoi Kawaguchi one lost his master and they part.
- "We'll help each other out if we're in trouble."
- I have no intention of needing the help of an assassin.
What does Fate have in store for them in the future?
Will they meet again? As enemies or allies?