In the light novel 'Marginal Operation' (マージナル・オペレーション), Arata, a 30-year-old determined to break free from a NEET lifestyle, embarks on a journey by joining a private military and security company. As he excels in training and enjoys light-hearted moments, the narrative takes a serious turn when he confronts the harsh realities of war. This action-packed story combines elements of comedy, drama, mature themes, and psychological depth, catering to a mature audience in the Seinen genre. With tags like 'Mercenaries,' 'Strategist,' and 'Wars,' the novel offers a gripping narrative of a clever male protagonist navigating modern-day challenges.