"Mobile Suit Gundam Thunderbolt" is set during the One Year War, a conflict between the Earth Federation and the Principality of Zeon. The story unfolds in the Thunderbolt Sector, a region of space filled with debris from destroyed colonies, making it a hazardous battlefield. The narrative alternates between two primary perspectives: the Earth Federation's Moore Brotherhood and the Zeon's Living Dead Division.

The Earth Federation's Moore Brotherhood is led by Io Fleming, a skilled but reckless pilot who operates the RX-78AL Atlas Gundam. Io is driven by a desire for personal glory and a deep-seated need to prove himself. His unit is tasked with securing the Thunderbolt Sector, a strategically vital area for both sides. The Brotherhood's mission is complicated by the harsh environment and the constant threat of Zeon forces.

On the Zeon side, the Living Dead Division is composed of soldiers who have lost limbs in battle and use advanced prosthetics to continue fighting. Their leader, Daryl Lorenz, pilots the MS-06R Zaku II High Mobility Type, a customized mobile suit equipped with long-range weaponry. Daryl is a more reserved and introspective character, contrasting with Io's brashness. The Living Dead Division is determined to hold the Thunderbolt Sector, viewing it as a last stand for their honor and survival.

The conflict intensifies as both sides deploy increasingly advanced mobile suits and tactics. The Atlas Gundam, equipped with specialized equipment for navigating the debris-filled Thunderbolt Sector, becomes a symbol of the Federation's technological edge. Meanwhile, Daryl's Zaku II is modified to excel in long-range combat, reflecting the Zeon's adaptability and resourcefulness.

As the battles rage, the series explores the psychological toll of war on its characters. Io's arrogance and recklessness lead to strained relationships with his comrades, while Daryl grapples with the loss of his limbs and the moral ambiguities of the war. The narrative delves into themes of survival, sacrifice, and the dehumanizing effects of prolonged conflict.

The series is notable for its intense and visceral combat sequences, which highlight the destructive power of mobile suits and the chaotic nature of the Thunderbolt Sector. The soundtrack, featuring jazz music, adds a unique atmosphere to the battles, contrasting the brutality of war with a sense of melancholy and nostalgia.

"Mobile Suit Gundam Thunderbolt" provides a focused and gritty portrayal of the One Year War, emphasizing the personal struggles of its characters amidst the larger conflict. The series stands out for its detailed animation, complex characters, and exploration of the human cost of war, making it a compelling entry in the Gundam franchise.