Darker than Black: Gaiden - Wikiwand

Darker than Black: Gaiden is a Japanese original video animation series created by studio Bones and directed by Tensai Okamura. It is a sidesequel to the anime television series Darker than Black and a prequel to Darker than Black: Gemini of the Meteor. It consists of four episodes about the main character Hei and his partner Yin, with the events taking place between both seasons. After betraying the Syndicate organization, Hei and Yin escape from Japan to live a peaceful life, but Yin later develops a god-like alter ego that causes mayhem.

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Hei (Darker than Black) - Wikiwand

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List of Darker than Black characters - Wikiwand

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Hei (Darker than Black) - Wikiwand

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Darker than BLACK – Gaiden 02 – Random Curiosity

List of Darker than Black: Gemini of the Meteor episodes - Wikiwand