Ability Wars Saga

The Ability Wars Saga is the first saga in the Bungo Stray Dogs manga and anime series.

Synopsis
The protagonist, Atsushi Nakajima, was kicked out of his orphanage out of fear of his ability. Weeks later, he is offered by Osamu Dazai to join the Armed Detective Agency. As Atsushi tries to adapt to his new life in the detective agency with his supernatural powers, a bounty of seven billion yen was placed on his head by a North American organization of Ability users called The Guild, causing the Port Mafia to attack him and the agency, all resulting in a three-way conflict between the three organizations. Being in the epicenter of the conflict, Atsushi and the Armed Detective Agency fight back to protect themselves and the city of Yokohama from falling.

Summary
Atsushi Nakajima, was kicked out of his orphanage. Weeks after that, he meets a man named Osamu Dazai and his partner Doppo Kunikida. The two of them are members of the Armed Detective Agency and are looking for a rampaging tiger. Atsushi helps them look but it turns out that he was the tiger all along. After the tiger hunt, Dazai gives Atsushi a position in the detective agency. As Atsushi is adapting to his new life in the organization, a bounty of 7 billion yen is placed on him and the agency's longtime rival, the Port Mafia, target him and the agency.

After the bounty failed, the leader of The Guild and the man responsible for placing the bounty on Atsushi's head, Francis Scott Key Fitzgerald, comes to Yokohama and has his sights set on buying the Armed Detective Agency's Skilled Business Permit. However, the agency's president, Yukichi Fukuzawa, refuses to give up the permit saying it can't be bought. After their meeting, the Guild declare war on the agency and the mafia with "messages" for both organizations. In the middle of the war, the Guild launches their emergency plan to incinerate Yokohama. After the agency save the city from the Guild's incineration plot, they form an alliance with the Port Mafia to defeat the outside force that threatens the city they cherish. The Guild's final plan of destroying Yokohama begins by attempting to crash their flying base called the Moby Dick into the city. With the Armed Detective Agency's Atsushi Nakajima and the Port Mafia's Ryūnosuke Akutagawa working together, the two of them defeat Fitzgerald and stop the Moby Dick from descending. However, someone hacks into the ship and starts it's decent into the city again. Former mafia member,Kyōka Izumi, stops its decent by forcing the Moby it into the sea.

After the conflict against the Guild, the Armed Detective Agency go back to their normal daily task of doing client jobs. Meanwhile, the Port Mafia captured Fyodor Dostoevsky, the leader of the Rats in the House of the Dead and the man responsible for the destruction of the Moby Dick. However, Fyodor getting abducted was part of his plan to steal info about the Port Mafia's ability users. Being successful, the next phase of Fyodor's plans to crush the mafia and the detective agency begins. As for Fitzgerald, he gets back up on his feet after his defeat thanks to his right-hand woman, Louisa May Alcott. Fitzgerald works to rebuild his organization and obtains new assets to help him in his goal of finding the reality altering Book.