text: Nomura is the writer that conceived the character of Amber and was credited at being really good at depicting beauty of humanity with cruelty. Nomura wrote multiple episodes focused on relationships as well as the final parts involving Amber, giving her a tragic ending despite the character staying on Hei's side until her death. Sunayama handles all the gang related stories, including the Hong Kong mafia, and Japanese yakuza. In his story, the desires of the characters are extracted and deferred. In his writing, Nomura finds Hei as funny from time to time, as he is trying to pretend innocent and naive as a Chinese international student while his strength as a spy just overflows. Then Suga, the most important writer in the Darker than Black series, handles high concept and main plot related arcs, with Hei on the spotlight.
  The Havoc arc first reveals to audience the possibility that Hei is not a Contractor. And then comes the inside-the-Gate episodes is the first time change really takes place for Hei's character arc after meeting a man who shares the same dreams as him. Suga is the one closest to Okamura's worldview, since they kept doing the throw and catch, he asked Okamura about the settings, and helped him extract what and how he wanted to express. With Suga's control of the last few arcs, take the doll selling as example, the stories starts to converge, and the ending is designed by Suga.