1. Bölüm: Kei Nagai, bir kamyon kazası sonrası ajin ölümsüzlüğünü keşfeder ve yalnızlığa çekilir.

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Kei Nagai is a good student whose life turned upside down when he was struck by a truck. After this accident he discovers that he is an immortal (ajin). Feeling shocked and panic, he runs away to an isolated place. Now he can't trust anyone but his childhood friend Kaito. (Source: Wikipedia)