Darker than Black: Kuro no Keiyakusha Gaiden

Synopsis

After having a dream where she’s being pulled on by a glowing child-like figure, Yin wakes up to Hei watching over her, and he promises to protect her. The two soon arrive in Hong Kong, and Hei finds a man named Chen to make some fake passports for them so that they can keep running. Yin, however, speaks out because she feels that it’s pointless and suggests attacking their enemies instead. She proposes spreading the rumor that he wants to sell her in order to lure their enemies in, and she believes that they can’t run away while there’s a Doll watching her. All of this plus Yin’s attitude worries Hei, but he decides to have Chen set everything up. While Chen is away, Hei questions why Yin didn’t tell him about the enemy Doll, but she seems not to remember what she said before. She does tell him though that she wants to be with him like this forever. Chen then comes running back because he encountered a dangerous group while spreading the rumors, but Hei is undeterred...

(Source: Darker than Black Wiki)