Recaps

Kenichi Amamiya advanced his research under Orochimaru, developing a method to induce cancer with Yang Release Chakra while becoming entangled in Orochimaru’s experiments and Konoha’s political changes. The arc left Kenichi testing his technique on a Chunin and considering what other powerful abilities and materials he might obtain.

• Kenichi Amamiya completed his research on Hashirama Senju’s Sage Body, strengthened his Chakra, and joined Orochimaru’s experiments on the First Hokage’s Cells.
• Kenichi Amamiya examined a Hyuga prisoner’s abnormal cells and discovered that Yang Release Chakra made the cancer cells multiply before dying.
• Kenichi Amamiya experimented on captives with nicotine and Yang Release Chakra, while Orochimaru taught him Impure World Reincarnation and warned him about Danzo’s plans.
• Orochimaru left Konoha after Minato Namikaze became Fourth Hokage, and Kenichi Amamiya prepared to continue his research while avoiding the fallout over the cell experiments.
• Kenichi Amamiya learned that Kushina Uzumaki was pregnant and kept away from the Fourth Hokage Couple, while he continued investigating his own projects and the long-extinct parasite in his Insect Amber.
• Kenichi Amamiya attempted to develop Cancer Bestowal Ninjutsu, and Orochimaru provided him a Chunin-level test subject for the experiment.
• Kenichi Amamiya induced early-stage lung cancer in the Chunin with nicotine and Yang Release Chakra, then made the cancer visibly advance while Orochimaru ordered him to document the symptoms and survival time.

Kenichi Amamiya stole Kakashi’s Mangekyō Sharingan during the Nine-Tails Attack, then defected from Konoha alongside Orochimaru and pursued his research. The arc left Kenichi accepted into Akatsuki after defeating the Preta Path with Sage Mode, while Orochimaru’s membership awaited confirmation.

• Kenichi Amamiya secretly replaced Kakashi’s Mangekyō Sharingan with a Three-Tomoe Sharingan just before the Nine-Tails attacked Konoha, then gathered Nine-Tails Chakra and Naruto Uzumaki’s blood amid the chaos.
• After the attack, Kenichi Amamiya took Minato Namikaze’s hair from his funeral and helped Orochimaru plan a mechanical arm for Hiruzen Sarutobi, who later received a compatible donor arm.
• Jiraiya attacked Orochimaru’s laboratory over his experiments, and Kenichi Amamiya escaped a fight with Root before Hiruzen Sarutobi declared him and Orochimaru rogue ninja.
• Kenichi Amamiya learned to sense Natural Energy and continued his research while helping Orochimaru train Yuki, then left to investigate changes in the Land of Rain.
• While traveling, Kenichi Amamiya encountered Kakashi, who was hunting him and Orochimaru, and later used Impure World Reincarnation on a bandit, but the sacrifice could not bear the First’s soul.
• Kenichi Amamiya entered the Land of Rain and asked Pain to let him and Orochimaru join Akatsuki, then accepted the Preta Path’s challenge.
• Kenichi Amamiya used the Preta Path’s Chakra absorption to enter Sage Mode and make it turn to stone, after which Pain accepted him into Akatsuki and gave him Orochimaru’s ring to return.

Kenichi Amamiya joined Akatsuki’s efforts to raise funds while pursuing explosive research, crop improvements, and experiments with Orochimaru. After he and Sasori killed Jūzō Biwa in the Land of Whirlpools, Kenichi prepared to test his Chakra Thermobaric Bomb in the Land of Lightning.

• Kenichi Amamiya gave Orochimaru the Kong ring, and Orochimaru accepted Akatsuki’s invitation before leaving to test Nagato’s strength.
• Kenichi Amamiya robbed Gato of more than one hundred million ryo, spared him, and later developed a powerful thermobaric explosive after destroying his laboratory in an experiment.
• Kenichi Amamiya proposed researching higher-yield crops for the Land of Rain, and Nagato agreed to consider supporting the work if he produced results.
• Kenichi Amamiya helped Orochimaru induce cancer in Hajun Shin’s arm and cultivated the resulting cells while continuing research on a replacement arm for the Third Hokage.
• Kenichi Amamiya crafted a five-ton Thermobaric Bomb, and Nagato assigned him and Sasori to recruit or kill Jūzō Biwa in the Land of Water.
• Kenichi Amamiya and Sasori found Jūzō Biwa in the Land of Whirlpools, killed him after he attacked, and took Kubikiribōchō, his money, and a finger for research.
• Kenichi Amamiya collected Reaper Masks from the Land of Whirlpools, then decided to prioritize crop research and testing the bomb over investigating legends and the masks.
• Kenichi Amamiya learned that Akatsuki had accepted Konoha’s bounty commission against Kumogakure ninja and headed with Sasori to the Land of Lightning to test the bomb and assess battle losses.

Kenichi Amamiya tested his Thermobaric Bombs on Kumogakure and the Land of Frost, earning a huge bounty and funding his research. After learning about a rumored flying city and returning to the Land of Rice Fields, he crossed paths with Jiraiya and discovered the manuscript was about Orochimaru.

• Kenichi Amamiya and Sasori tested a modified Impure World Reincarnation in the Land of Lightning, then fled after Killer B caught them near Kumogakure.
• Kenichi Amamiya and Sasori dropped a Thermobaric Bomb on Kumogakure, destroying part of the village and prompting Konoha to spread rumors about the attack.
• Kenichi Amamiya returned to Orochimaru, learned Kumogakure had placed a three-hundred-million-ryo bounty on him, and began building a laboratory in the Land of Rice Fields.
• Kenichi Amamiya researched Hybrid Rice while preparing another bomb, then traveled with Sasori to the Land of Frost to attack Kumogakure’s forces.
• Kenichi Amamiya countered the Eight-Tails’ Tailed Beast Bomb and dropped his Thermobaric Bomb, killing or injuring more than a thousand Kumogakure ninjas and gravely wounding Killer B.
• Nagato paid Kenichi Amamiya six hundred million ryo for the Konoha mission, and Kenichi paid Zetsu to learn about the Sky Ninja Village and its rumored flying city, Ancor Vantian.
• Kenichi Amamiya went to a black market for bomb materials, killed two sisters who tried to poison him, and took a merchant as a Living Sacrifice.
• Jiraiya approached Kenichi Amamiya and offered him a manuscript titled “The Story I Had to Tell About Orohime,” which featured a character based on Orochimaru.