The life of a private mercenary is far more grueling than he could have ever imagined!Our hero Ryouta Arata is an otaku who's just lost his job after the dissolution of his company. Unwilling to return to his old NEET ways, he applies online to a private military security company, thinking the benefits to be promising. After what appears to be a baffling test, he's assigned to be an "operator of operators" and begins his training in a foreign country.
With Arata's training camp now complete, he's sent off to his first official post as a PMSC employee. Determined to atone for the sins he unwittingly committed, he tackles his new job with zeal, trying his best to keep as many people alive as possible. Unfortunately, the mercenary life is a harsh one, and the darkness within PMSC runs far deeper than Arata could have ever imagined. Can he stay true to his ideals despite coming face-to-face with the horrors of war?
Arata had come to accept the weight of his life-or-death decisions, but with his own life on the line for once, will he be able to keep his cool under fire? Even as he faces this new challenge, his mastery of battlefield tactics has caught the attention of a mysterious group of combatants in this endless war. Will he live to fight another day?
No Place Like Home... A year has passed since Arata took the child soldiers under his wing - after discovering they were on the receiving end of his orders. In that time, he has toured numerous battlefields across Asia, while doing his best to provide for the kids under his care. Fed up with forcing them to continue to fight just to survive, Arata takes them to Japan in hopes that his peaceful homeland may provide a solution to the dilemma he faces.
Chaos Hangs in the Air... Everything seems to be going wrong as Arata's client, the Japanese government, fumbles in their handling of the job's agreements. As conflict begins to heat up within the country, Arata is forced to take to the bustling streets of Tokyo and face off with the terrorist cult. Will he and the kids be able to survive in this unfamiliar battlefield?
After forming a truce with the cult they were originally contracted to confront, Arata and his crew set out for Thailand. Immediately upon landing, a rich aristocrat by the name of Li Seiran comes to him with a proposition—to stop a certain company from trafficking children out of the country. But with his reputation as the renowned Headmaster now flowing through mercenary channels, will Arata still be able to keep his kids safe?
A Storm Is Brewing...Having come to Thailand in the hopes of finding a way to support his children without forcing them onto the battlefield, Arata instead finds himself being asked to recruit more children from the slums and expand his mercenary operations. It may be the only way to save them from being exploited by a far more predatory company, but he still feels conflicted about sending yet more children to war. Will he be able to escape this industry before it claims the lives of his precious kids?
The fires of vengeance burn on…With Arata's battle against his former employer concluded, the situation’s finally stabilizing. After careful deliberation, he decides to recruit child soldiers from Thailand’s slums on Miss Li’s request. Unbeknownst to Arata, while his rival company may have backed out for now, there are still those within it whose personal grudge against him won't let them rest until they've had their revenge.
GOOD FRIENDS - BETTER ENEMIESArata believed his travails in Thailand were over, but Kishimoto has other plans. The moment Arata lets his guard down, his former colleague strikes, kidnapping Hakim and Sophie. For the first time, Arata must contend with the imminent threat of a subordinate’s death. Will he crack, or will he find a way to follow through under such pressure?
Pushing foreign borders...Arata finally makes the move against the Chinese army his sponsors have been waiting for. The effort goes well at first as he recaptures a series of villages with no casualties, but his seemingly unstoppable momentum grinds to a halt as Arata discovers deeper complexities to this struggle than he ever imagined...
Old Paths Intertwine...As the Burmese army terrorizes the local population, Arata realizes he has to clean house before he can focus on the Chinese. His efforts to end his allies' suppression of their own citizens lead him to Yangon, where the UN peacekeeping team is detained and an unlikely reunion lies in wait for him…
Tensions flare amidst jungle warfare...The battle in Myanmar rages on fiercer than ever before. China has deployed their helicopters and drones, while Arata's allies, the Burmese Army, turn out to be far less reliable than he'd hoped. It will take the full extent of his considerable wit to continue winning his battles and keeping his kids alive. Fortunately, by rescuing the nearby villagers from their own government's tyranny, he may have inadvertently created the perfect strategic opportunity for himself.
Going on the offensive...With the Chinese Army presenting an overwhelming difference in firepower to his own forces, Arata employs guerrilla tactics to successfully take out a key refueling base. However, this enrages the Chinese Army more than expected, leading to an air strike against Camp Hakim in retaliation. With the Burmese Army still disorganized and his sponsors unwilling to lend further aid, the only person Arata can rely on to get them out of this mess is himself.
Reunions abound...Now that Arata has secured sponsor funds, he's ready to procure the anti-aircraft weapons he so desperately needs. But before that, he encounters some old friends—and enemies! Laying his grudges to rest, he moves forward with fighting back against China's aerial forces. Win or lose, nothing will bring back the people he's already lost, but he can't afford to stop now.
The final push...Arata Ryouta, a former NEET, is now a world-famous mercenary who leads a platoon of child soldiers against the Chinese army. Despite only having 3,000 troops under his command, he's succeeded in countless campaigns against a force tenfold his own. Revered and reviled by allies and enemies respectively, Arata has one last marginal operation to complete before his story comes to a close.