Isako meets her client, Director Forest Greves, at the Astrocom headquarters’ observatory. Greves expresses guilt over the dismissals and his division’s failure in a years-long corporate war against the Company’s Satellite Operations (SatOps) division. He’s bitter that the “terraformists,” a political faction focused on making the planet Aquilo habitable, are gaining power, citing the Directors’ nomination of their leader, Sandbar Uchi, for a seat on the corporate board. 

Isako, who serves as Greves’s chief strategist and bodyguard, advises him to pursue a long-term strategy for a comeback. She suggests that he request a subdirector position under his victorious rival, Director Savannah Minto, and patiently work his way back to the top. Greves is skeptical but agrees to consider it. He worries that he will no longer be able to afford Isako’s services, but she reaffirms her loyalty under their “Exclusive” lifelong contract. He thanks her for her work and tells her to take a few days off.

Isako attends the “resignation” of the final group of dismissed Astrocom employees at Easthatch, one of the city’s main gates. Resignation is the public ritual in which dismissed employees die by suicide. Among the resigning employees is Dew Loren, whose daughter Tessa watches from the viewing platform. 

To Isako’s shock, Director Greves arrives unexpectedly. He gives an impassioned, city-wide speech denouncing the Company’s leadership for abandoning space exploration, a key point in the agenda of the “reunionist” cause that seeks to establish connections with other human colonies and, ultimately, Earth. In protest, Greves then declares his own resignation. He joins the other resignees and leads them through the airshield out into the frozen wasteland known as the Vastness. Isako watches, stunned and feeling like a professional failure for not anticipating her client’s actions. One by one, the resignees succumb to the hostile environment. Dew Loren outlasts most of the younger wagefolk, while Greves falls before him, turning to face Tenacity before kneeling and falling forward with his forehead to the ground. Isako is left a “ronin,” a contractor without a contract.

Now a ronin, Isako ignores a flood of messages about Greves’s shocking death, replying only to her daughter, Maya. She then receives an urgent summons from Director Minto, the head of SatOps who has now absorbed Astrocom. 

Isako goes to Minto’s headquarters and is escorted to the director’s office by two atier apprentices. The office is a stunning private garden filled with exotic plants, fish, and birds, showing Minto’s immense wealth. Minto herself is a “second stager,” a 106-year-old woman housed in a replacement body of advanced prosthetics and cloned tissue. Standing beside her is her atier, Cloud Sherae, one of Isako’s former apprentices. Minto has called Isako to her office to formally address the takeover of Astrocom in Greves’s absence.

Director Minto reveals that before his death, Greves transferred Isako’s lifelong contract to her. Since Company policy forbids a director from having two atiers, Sherae challenges Isako for the position. 

Isako, unwilling to fight her former apprentice, immediately requests permission to resign from her contract and the Company. Minto agrees but with a condition: She has negotiated 30 days with the Agency that manages Isako’s contract to resolve the policy violation and will only grant Isako’s resignation after she completes one final, secret assignment. Isako must accomplish this assignment within 26 days, aligning with the Board confirmation hearing. Minto tasks Isako with finding a way to stop the powerful terraformist leader, Director Sandbar Uchi, from being confirmed to the Board of Directors. Trapped by her professional code and financial obligations to her daughter, Isako has no choice but to accept.

Before starting her new assignment, Isako has a lunch date with her 19-year-old daughter, Maya. Isako struggles with telling Maya about her plan to resign and ultimately fails, instead listening to Maya talk about her studies and boyfriend. 

After their meal, Isako departs for Agency headquarters, a massive building that was once a church. Her goal is to access the contractor directory and find her former apprentice, Dragonfly Martim, who is now Director Uchi’s atier. She hopes to use their past connection to get information about Uchi.

To regain her access rights at Agency headquarters, Isako must undergo a mandatory relicensing test. Using immersive technology, she’s put through a series of simulations testing her business acumen, ethical judgment, and combat skills. 

The final scenario involves a violent attack on a formal event where she must protect her client. The simulation is designed to end in her death, regardless of her performance. She experiences a convincing and agonizing simulated death by grenade blast, a process intended to reinforce a contractor’s psychological acceptance of their own mortality as an inevitable part of their profession. After the test, she collects herself and proceeds through a door to meet with the Agency’s leadership.

Isako meets with three Agency Partners: Her former mentor, Ocean Constance; a man named Island Garik; and the infamous Marsh Elias, known as the “Ronin Killer” for his role in terminating rogue contractors. All three Partners show unusual interest when Isako asks to contact Dragonfly Martim. Constance reveals that Martim’s “Principal” contract was extended about a month ago but that he hasn’t been seen or heard from since, which is strange for an atier serving a high-profile client like Uchi. 

The Partners grant Isako access to Martim’s address and personal ID but warn her of the political danger involved in challenging Uchi. Isako assures them that this will be her last contract, as she has already requested permission to resign.

Isako travels to the wealthy Southern Continent Gas Production (SoCon GasPro) district and checks into a hotel. She hires a trusted information broker, a subcontractor named Crater, to find any compromising information on Uchi. She also reviews the public records that Crater sends on Uchi. 

The next morning, she goes to Martim’s apartment, but the building manager informs her that Martim hasn’t been seen for over a month. Inside the empty apartment, Isako finds no signs of a struggle or planned departure. She discovers an empty, single-dose injection pen labeled “Sudexatrine 02” and a coaster from a nightclub called Epic Vibe with a name, “Vincent,” and a meeting time written on it. As she leaves the building, Isako is intercepted by Condor Anand, the atier for Director Tide Sullivan, Uchi’s most powerful ally.

In his car, Anand, an influential atier known as the “Puppetmaster,” tries to bribe Isako into abandoning her mission against Uchi. He argues that Savannah Minto is using Isako as a disposable pawn and that Uchi’s rise is inevitable. 

Isako refuses the offer, stating her duty to her client under the Code. Anand’s attempt to buy her off only strengthens her suspicion that Uchi is hiding something significant. Before dropping her off, Anand ominously asks if Martim was home and then reveals a startling rumor: Martim is dead.

Back in her hotel room, Isako calls her subcontractor, Crater, who confirms Anand’s rumor: A death certificate for Dragonfly Martim was filed 25 days ago, though no cause of death was listed and no public announcement was made. This is a major violation of Agency protocol. Isako immediately informs Agency Partner Ocean Constance, who claims that the Agency was unaware of Martim’s death. Citing the alignment of her client’s interests with the Agency’s need for an inquiry, Isako convinces Constance to grant her official authority to investigate. With Martim dead, Isako’s only lead is the coaster from his apartment. The note tells her when and where she can find Vincent.

On Monday night, Isako goes to the Epic Vibe nightclub to find Vincent. He turns out to be a freelancer who deals drugs from a booth on the second floor. Vincent admits that Martim was a regular customer, buying bliss and amp tabs. However, he doesn’t recognize the sudexatrine injection pen that Isako found. More importantly, Vincent reveals that Martim was also paying him for information about any potential survivors of the Field 93 disaster, a notorious incident that Director Uchi was investigated for and cleared of. Vincent believes that Martim was being followed because of his inquiries and was likely murdered.

Isako offers to pay Vincent for the names of his other clients in SoCon GasPro. Vincent creates a diversion and flees. Isako gives chase into a back alley, where she’s ambushed by three of Vincent’s armed associates. She’s stabbed in the side but manages to kill her initial attacker with her longknife. 

Before the other two men can press their advantage, the fight is interrupted by the club’s bouncer. To Isako’s astonishment, the bouncer is Rain Kob, a legendary atier known as “Strikebreaker” and her old friend and partner. Kob, who is now a ronin, calmly de-escalates the situation, prompting the remaining attackers to retreat. Seeing that Isako is injured, Kob insists on taking her to a clinic.

After getting her wound treated, Isako accompanies Kob to his small, spartan apartment to rest. The next morning, over a rare breakfast of fresh eggs, Kob explains why he became a ronin. He says that he grew exhausted with the violent life of contract work after a particularly difficult assignment. Instead of seeking a new contract or resigning, he simply allowed his professional license to expire. 

Isako then explains her own situation. She tells Kob about Dragonfly Martim’s mysterious death and his investigation into the Field 93 disaster. Upon hearing this, Kob reveals that he knows where to find the only survivor of the incident.