Kei Nagai Husbando

Kei Nagai is an Ajin and the main protagonist of the series. Nagai Kei is a young man who spends most of his time by alone, studying or just keeping to himself quietly. He's voiced how much he dislikes physical activity as he "comes from a white collar background". He has short black hair as well as pale skin. He has thin black eyebrows. He's 5'5, slightly short for his age, and has a fairly normal body shape/proportions- though he puts on weight easily. In the anime, Nagai's eyes are a dark red colour. At the start of the manga, his eyes appeared black, before later becoming a piercing red. After falling into the care of the ajin research facility, his hair is shaved short and appears spikier. In the anime, it stays the same length, but in the manga, it grows back to its original length. Nagai is first shown to wear a plain, white button-up shirt and black trousers- his school uniform. He has been seen in many different outfits throughout the manga/anime, usually consisting of baggy trousers/shorts and a t-shirt that sakurai (mangaka) likes to draw with an ironic design/logo depicted on them, depending on the situation Nagai is in. Nagai was first shown with an academic, serious, almost cold personality. He would often get lost in his thoughts, leading him into getting in a car accident as well having his identity as an Ajin revealed to the entirety of Japan. Afterwards, it is revealed that Kei is a complete pragmatist and emotionally detached from others. He is very intelligent and hardworking with ambitions to be a doctor who finds treatments or cures illnesses that don't yet have one; specifically to cure his sister Eriko, who has a long- term disease that affects her mobility and normal functions, which is thought to originate from genetics. However, Eriko observes that Nagai is not thinking about her at all and is only pursuing this goal for his self-interest - but it is shown that Nagai cares for his sister. Nagai seems to have strong personal values that he tries to live by. He demonstrates gratitude for Kaitō's help and cares about his welfare. He's also able to endure torture without killing or retaliating because it wouldn't be fair if he didn't risk everything beside his life while Kaito put his life on the line. He also doesn't begrudge Satō for having killed others to free him, but does not support killing more people unnecessarily. He is also quite sarcastic and answers things in deadpan, such as the time when he casually mentioned that Tosaki should have died too or calling Kō a blue-collar boy. Because of Nagai's emotional detachment from other people, he'd always found it difficult to show his emotions. Even as a child, he was shown to be pretty calm and reserved to himself, but abnormally inexpressive for his age. This is the main reason why he doesn't have the best relationship with his little sister Eriko- even though he cares for her, he hasn't been able to show it very well, which has caused her to think that he is a cold-blooded jerk that is only trying to help her out of his own self-interest. This emotional detachment has not only complicated his relationship with his sister, but all of the relationships he has with his friends/family and other people. A significant example is his relationship with his best friend Kaito. Even though Nagai is presented to be rather rational and cold towards Kaito, we later on find out that Nagai cares about Kaito more than Kaito even cared for him. With Kaito having a hardcore saviour-complex and an appetite for violence, it was his nature to go out and save Nagai again and again, risking his life and fighting for his 'friends' is a no-brainer- a need and a must- for him, even if he wasn't particularly friends with the person beforehand. So saving Nagai's skin a couple times was like a simple favour in Kaito's eyes. However, for Nagai it isn't that simple. He usually puts himself first, but has shown to care about Kaito and put Kaito before himself in many situations- not just because Kaito's a human, but because Kaito is his friend (we know this because of the way that Nagai treats most humans- he even regarded the black suits and Hirasawa as just tools). Nagai has risked not only his life, but his body for Kaito many times throughout the manga (and in the anime too). For example, when he refused to kill the researchers while being experimented on even though it would mean that he could escape the torture they were putting him through. He seldom cries throughout the animanga but he's cried for Kaito; "If I do this.. Kai might hate me" "If I don't risk everything I have besides my life, It wouldn't be fair to Kai." It's crystal clear that Nagai cares about Kaito, and leaving Kaito behind -pushing him away- was Nagai's way of keeping each other safe, and protecting him from danger. Nagai was not only pushing Kaito away to keep him out of danger, but protecting himself as well, because Kaito could easily be kidnapped and used as a tool by others to get to/manipulate Nagai. And Kaito understood this, to an extent at least, and that is why they were able to stay friends despite being separated for most of the time that they'd been acquainted. He is ultimately calculating and utilitarian, but can be kind in important situations as well. He saves a doctor's life who helped Kei escape out of his values by shooting Sato instinctively and saying that it is wrong to kill the researchers. However, Nagai denies his empathetic side often and claimed that he only did it because the researcher sympathized with Ajin. He is shown to not be afraid to die as an ajin, as he'll just come back to life but he is cautious of the consequences of dying. According to his sister Eriko, Kei is logical and heartless to the core and is only appearing to care because the situation demands him so. He seems to have gotten his cold demeanor from his mother. However, his mother claims that he got a bit of his father's caring side, no matter how much he tries to hide it.