Kei Nagai

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Kei Nagai is a male character who features in Ajin: Demi-Human.



Kei Nagai (永井 圭, Nagai Kei)

Trapped, Sato told Nagai that he was going to kill him by severing his head and watching a new head regenerate that could see his personality possibly change as his old one died. In that moment of extreme emotion, he came to manifest the rare flood phenomena where he manifested his ghost multiple times with one spearing Sato in the back. Together, the Black Ghosts attacked him and ultimately cut off his head with his personality dying as a new head regenerated though this one was also dedicated in killing Nagai. At that point, American special forces had arrived where they killed Sato to delay him long enough until they could use tranquilisers to neutralise him. As they arrived at the scene, they apprehended Kei as well until Tosaki vouched for him and reminded the Americans of the deal they had that allowed them to take Sato along with Tanaka. Thus, Kei was seemingly freed from the life of being on the run and Sato's war with the Japanese government moving to secure Ajin rights. In the aftermath, his relationship with his own sister had seemingly improved as well. It was then he received a call from Tosaki who informed him that Sato had escaped the Americans during transport and was fee once more to continue his war.


Personality and attributes

Powers and abilities

Similar to other Ajin, he was able to manifest a Black Ghost that was composed of a substance known as Invisible Black Matter (IBM). Unlike other Ajin, however, the concentration of IBM was notably 3 times denser allowing for Nagai to manifest on it on average 5 times a day and a maximum of up to 9 times. In contrast, normal Ajin were only able to call upon their Black Ghost a maximum of twice a day after which they needed to rest over a long period before it could manifest again. Kei tended to have poor control over his Black Ghost that tended to operate on its own and even did the opposite of his commands with it even attacking him on some occasions. This changed in time though his ghost had a tendency to respond angrily at some of his commands. He came to experience the rare Ajin phenomena known as a flood where in a moment of extreme emotion he released multiple Black Ghosts at the same moment.


  • Kei Nagai was created by Gamon Sakurai and featured in the setting of Ajin: Demi-Human.


  • Ajin: Demi-Human:

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