Picked from what people who watched this went on to watch.
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Kei discovers the curse of immortality when he gets hit by a bus... and doesn't die. Now on the run from a government that wants to experiment on him, and his fellow Ajin, Kei's only hope to live a peaceful life lies in his ability to learn how to use his new powers. Aided by the strength of his "Black Ghost", a once apathetic Kei must now fight to avoid becoming a cruel demi-human experiment.
Kei Nagai dies in a car accident, but realises he is a type of immortal known as Ajin. Hunted by humans, Ajin is eventually found by the government and used as a subject in cruel experiments. He finds fellow demi-humans along the way as he escapes and goes on the run.
The story starts following an incident: a young girl jumps from the top of a building. The image provokes a certain dread, as the girl appears to have been a corpse even before she jumped. The case is dismissed, yet more and more of these suicides occur, and all from the same building. Thus began the rumour, that a ghost inhabited the rooftop of the building.
It's the year of destiny, and 15 year old Kamui Shiro, a powerful psychic, has returned to Toyko after a 6 year absence, having left when he was very young. He wants to be with his childhood friends, Fuma (his best friend) and Kotori, Fuma's little sister (and Kamui's possible girlfriend). He wants to protect them from all dangers, but destiny and fate are haunting Kamui and pulling in himself and his beloved childhood friends. It is his destiny and his sole decision to decide the fate of the world, no matter if he wants the role or not. Now it is a matter of if he will join the side of the Seven Seals and become the Dragon of Heaven to save mankind or join the Seven Angels and become the Dragon of Earth to destroy all civilization so the earth can heal itself from man's destruction.
In a society devastated by the effects of an all-out war between heroes and villains, a mysterious giant fortress suddenly appears, engulfing towns and people one after another. Then, a man reminiscent of All Might, the 'symbol of peace', stands in front of Izuku and his friends...
Ten Years ago, Genichiro Izayoi died trying to stop the sorcerer Rebi Ra, and as a result Shinjuku became a playground for demons. And now, the day approaches when Rebi Ra will complete his decade-long ritual to plunge the rest of the world into chaos! As Genichiro's son, it falls to Kyoya to venture into the heart of Shinjuku and put an end to the sorcerer his father couldn't beat. Can Kyoya exceed his father's legacy, or will the demons of Shinjuku create Hell on Earth?