The Jaegers (イェーガーズ, yēgāzu) was a special Police Squad made to combat Night Raid and curb criminal activity in the Capital at the behest of The Emperor. Led by Esdeath, the unit was solely made up of Teigu users pulled from various departments or divisions in The Empire's military.
After subjugating the Northern Tribe, Esdeath was recalled to the capital and upon receiving reward to handle Night Raid. She made a request to Prime Minister Honest to establish Jaegers. Several weeks after her request, the Jaegers was established with Esdeath as Captain and Run as Strategist and Second in Command. One of the first acts of the Jaegers, much to most of the members' bewilderment, was to find Esdeath a lover. Due to the tournament held for this purpose, Tatsumi was brought to the Jaegers. One of the earliest missions of the Jaegers first had them assault a bandit fortress as a show of their powers to Esdeath, felling the base with ease. After being forced to train with Wave in the mountains, Tatsumi befriends Wave but eventually escapes the Jaegers.
Becoming suspicious of Tatsumi's actions, Dr. Stylish tracks down Tatsumi, leading him to the Night Raid base. After an all-out assault by Dr. Stylish, his forces are decimated and he himself is killed by Akame despite going into his Danger Beast form.
Shortly after Dr. Stylish's death, the Jaegers prepare themselves for an attack against Night Raid, and divide themselves into two groups, the first consisting of Esdeath, Run and Seryu, and the second containing Bols, Kurome and Wave. As a result from the separation and conflict, Bols is killed, although Chelsea, who assassinated him, was shortly killed herself after attempting to take down a seemingly-weakened Kurome.
Shortly after, Seryu was also killed when she attempted to fight both Tatsumi and Mine alone. Although Tatsumi left the battle to deal with Suzuka, a Rakshasa Demon who had first spied the two Night Raid members trying to blend in with the crowd, he returned in time to save Mine from Seryu's suicide bomb.
Their next assignment was to protect Bolic from an anticipated attack by Night Raid. Although they anticipated the attack, Bolic was still killed due to a combination of Bolic's own overconfidence and lust, Susanoo's and Tatsumi's ability to distract Esdeath, and Chelsea's weakening of Kurome during the former assassination attack. However, in order to escape from Esdeath, Susanoo sacrifices himself to get the rest to safety.
With their current losses, and widespread rebellions, Esdeath was ordered to fight in the West, while the remaining Jaegers were stationed within the capital. During this time, the higher council deemed the Jaegers useless or weak, and decided to form a new group, Wild Hunt.
The very first interaction between these two groups occurred when Wave was informed by Bols' family of a group causing trouble. Upon seeing the public execution done by Wild Hunt, Wave immediately attempts to show his anger, but is stopped by Run, warning Wave that the leader of Wild Hunt is the Prime Minister's son.
Shortly after calming down, Wave is shocked to see that Bols' wife and child had been savagely killed by Wild Hunt during an investigation. Following this Kurome was also harassed by Wild Hunt, eventually causing Wave to finally snap and lash back against Wild Hunt, declaring that the "Jaegers will hunt down anyone who disturbs the peace," causing a fight between him and Wild Hunt leader, Syura. Wave defeats Syura in a fair duel witnessed by Grand General Budou personally, much to the latter's frustration, and Run reveals his own motivations: Champ, a member of Wild Hunt, killed his entire class back when he was a school teacher. That night, Run and Kurome leave to fight Wild Hunt at their own base just as Night Raid themselves move to take down the group.
In the resulting battle, Run is able to kill Champ, but is fatally wounded. On the verge of dying, Run uses his last strength to get Kurome to safety. He succeeds, but is then stabbed and killed by Kurome herself in order to turn him into a puppet.
Kurome went to fight her older sister Akame in a duel to the death. During the fight, Run and the rest of Kurome's puppets were all cut down, however before the two sisters could continue the fight, Wave intervened and stopped the fight. He confessed his love to her and shattered her Teigu. Wave and Kurome then defected from the Empire, leaving Esdeath as the last remaning member of the jaegers while both Wave and Kurome will retire from their services to cure Kurome.
During the final battle against the Empire, Akame, 10 teigu users and all 100,000 soldiers in the Revolutionary Army fought against Esdeath to their fullest. But Esdeath easily defeated the army and the 10 teigu users, and only Akame remained. Akame activates her trump card and goes all out on Esdeath and after a long-heated battle, Esdeath shattered Akame's teigu, but with its last amount of power, Akame was still able to defeat Esdeath and stabs her right through the heart. In her last moments, Esdeath accepts defeat and freezes herself in ice and shatters herself into pieces. With Esdeath dead, the Jaegers are finally disbanded and the group no longer exists.
Credits to https://akamegakill.wikia.com/wiki/Jaegers