A young man named Tatsumi seeks to save his hometown from financial ruin by making it big in the military with his martial prowess. However, he is unaware of the corruption that plagues the capital, and almost falls victim to it when he's rescued by an unlikely saviour, a group of assassins named Night Raid. Seeing potential in Tatsumi, Night Raid recruit him and explain that their goal is to end the corruption infesting their country by eliminating its source, the current Prime Minister.
The other members of the team take turns showing Tatsumi the ropes, starting with the group's deadliest member, Akame, and Mein, a sniping prodigy with an abrasive personality.
In the tankobon's bonus joke chapter, Mein makes good on her threat to banish Tatsumi to another series published by Gangan Joker.