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.

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...

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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 deadly 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.

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...