The Nameless Man is an ex-businessman and murderer who was killed by Lilei Ei in 2021.
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Prior to the story's start, the man is born and raised in mainland Japan, finding employment at a corporation whose corruption soon becomes evident to him. His attempts to expose the corruption are crushed by the corporation, and he murders several of the corporation's executives in retaliation.
The man's murder spree culminates in the murder of his boss' daughter, after which he flees to the Artificial Island in order to 'continue being in the right.' There, he murders Fei and becomes obsessed with Fei's friend Lilei. His self-introduction to Lilei on a rooftop is ruined when she proceeds to beat him in revenge for Fei's death, and he is thrown off the building. As he falls, he realizes that the reason he is obsessed with Lilei is because she reminds him of his ex-boss's daughter.
In an unexpected twist of fate, his terminal destination point happens to be right in the middle of a shootout between Seiichi Kugi and Hayato Inui. Both men accidentally shoot him right before he hits the ground, their bullets originally meant for each other.