Eye for an Eye is the fifth arc in the roleplay. It takes place in early February over the course of two weeks (IC). The arc covers multiple purposes for every faction, most of which had at least some connection. This is the first arc involving Shuukaku.
After Aogiri Tree scientist Satoshi releases several successful half-ghouls into Tokyo, multiple factions take action, leading to the main events of the arc. The two main events were the CCG's raid on Aogiri Tree's main base in the 11th Ward and the Inquisitors' raid on Satoshi's lab in the 22nd Ward.
Aogiri Tree Raid
Introduction
Somewhere in the 11th Ward, the One-Eyed Cat hunts down a half-ghoul and leaves them dying in the back alley of Anteiku with a message for Nikki Futago, telling him that she is waiting for him in the 11th Ward. Nikki plans to infiltrate Aogiri Tree alone to both liberate the remaining half-ghouls and find the One-Eyed Cat, but does not stop anyone who wants to accompany him on the mission.
The CCG captures one of the half-ghouls and brings her back to headquarters for interrogation. Rank 1 Investigator Alistair Bake interrogates her for Satoshi's name and the location of the 11th Ward base, and the half-ghoul is moved to Cochlea shortly afterwards. A raid on the 11th Ward is planned for February 6th.
Lab Raid
Introduction
The Inquisitors learn of a half-ghoul living in the 23rd Ward through one of their informants. After Shidu meets and brings the half-ghoul with her back to Yuureien, they begin a search for the scientist who has become active again.
Meanwhile, Aogiri Tree stations four guards at Satoshi's lab in the 22nd Ward. The four areMaki Itokawa, Kane Heyma, Kotome Nene, and Tojo.
Investigation
Shidu provides new hire Mei Haruko with information on the four Aogiri Tree guards who have been assigned as guards to the lab. Mei is given a large bribe and is told to obtain the location of the lab from one of the four. The informants eventually spot Tojo heading into a cafe in the 12th Ward, and Mei meets with him and obtains the location of the lab in the 22nd Ward.
Lab Raid
The raid on Satoshi's lab is planned for the evening of February 6th, the same day as the CCG's raid on Aogiri Tree's main base. Shidu assigns Ayano Morino, Akane Hayashi, Serafina Baxter, Lee, Hashiba, and Haru to retrieve Satoshi or his research and as many half-ghouls as they can from his lab, with payment ranging from C to S rank depending on the team's success. The human Inquisitors are given cloaks bearing the scents of ghouls to avoid raising alarm.
The building itself is three floors: a basement with cells containing the half-ghouls and an entrance to the tunnels, an empty ground floor with the layout of an office building, and an upstairs which serves as Satoshi's actual lab and research area.
The Inquisitors first gather on the rooftop of a nearby building to form a plan. It involves Ayano and Serafina maneuvering the rooftops to the other side of the building and entering through the top floor while Akane, Lee, and Hashiba enter through the front and cause a commotion. Haru is assigned to sneak in several minutes later to secure the half-ghouls.
Unbeknownst to them, Satoshi, feeling threatened, grabs the vital parts of his research and flees through the tunnels shortly before they arrive. Tojo abandons his post under the pretense of investigating a suspicious noise and goes after Satoshi, kidnapping him.
Upper Floor
On the second floor, Serafina and Ayano infiltrate the lab. Serafina remains hidden as Ayano approaches Maki and asks for her objectives, which Maki refuses to provide her with out of his desire to bring the research back for himself to coerce Juha Weirwight back from his research-purposed travels. Ayano openly reveals that she has been sent under Shidu and will be punished if she fails to meet expectations, but Maki refuses to aid her yet again. The two both think back to their pasts, then engage in a clash filled with casual dialogue, links to bananas, and trolling because it's a fight between Kakuja and Swine who am I kidding.
Maki slashes Ayano across the back and Ayano retaliates by leaving a gaping wound on his stomach and tearing his left arm apart with shards. With Maki weakened from his injuries, Ayano easily disarms him the next time he charges at her and pins him on the ground. However, Maki suddenly grabs onto her ankle and releases his kagune, shooting two projectiles at her that completely tear off her left arm at the elbow and leave her right arm barely on at the shoulder. Ayano falls unconscious and Maki stands up, looking at her for a bit before he is shot several times in the spine, kakuhou, and knees by Serafina.
Serafina treats Ayano since Maki is unable to move or use his kagune. After gagging him, she removes a chunk of meat from his calf and feeds it to Ayano, whom she awakened, to help her heal. This enrages Maki, but he is ignored as Serafina leaves Ayano leaning against the wall and goes downstairs to help the others.
Ground Floor
Akane kicks the front door in, laughing loudly and firing ukaku shards everywhere while swinging her rinkaku around, waking Kane up and drawing him over. The two engage in combat and deal significant damage to each other, destroying much of the environment around them, until Serafina arrives downstairs and incapacitates Kane with four bullets. Serafina then instructs Akane to head upstairs and retrieve Ayano while she heads downstairs.
Basement
Down in the basement, Achille is watching the half-ghouls in the storage room. With Haru waiting outside, Lee suddenly bursts into the storage room with his bikaku exposed, and Achille mistakes him for Tojo. Achille then fends off Lee's attacks while asking why "Tojo" is attacking him, and Lee points out that he is not Tojo. Hashiba then runs in and attempts to attack Achille, but gets a stool thrown at him instead. Lee and Hashiba then double team Achille until Lee runs off to free the half-ghouls while Hashiba occupies Achille.
As Lee frees the half-ghouls and convinces them to follow him outside, Achille pins Hashiba using his shield, forcing Lee to return to intervene. After Achille batters Lee as well, Serafina comes downstairs and keeps Achille's attention while Lee and Hashiba escape with the half-ghouls.
While Serafina continues to distract Achille, Shidu suddenly emerges from the deeper end of the basement, having entered through the tunnels. Serafina informs her of the events of the raid up to that point, then leaves with the rest of the Inquisitors. Shidu easily overwhelms Achille but spares him, expressing her disdain for Aogiri Tree before kicking him in the direction she came from and instructing him to escape through the tunnels.
Post Raid
After the rest of the Inquisitors have left, Shidu leaves Achille downstairs and heads upstairs, where she sees the incapacitated Kane. She checks that he is still breathing before ascending to the second floor, where she ignores the paralyzed Maki for well over an hour as she looks around the lab. Finally, she acknowledges his presence only to mock his failure as a leader and dream, which she believes is unattainable, and the two converse for a while with Shidu informing him of the CCG raid that happened earlier in the day before she takes all of the files left in the lab and leaves.