Is there a continuation of Darker than Black: Gemini of the Meteor? I finished watching the second season of Darker than Black: Gemini of the Meteor, and seeing how it ended it seems like there may be a continuation since there are some questions left unanswered at the end:


   1) Amber seemed to have wanted Hei to know the prophecy so did she wanted Hei to seal Hell's Gate in Season 1 solely to prevent it
 2) Yin says for Hei to "Take her Life", since Hei's Powers are actually Pi's because she fused with him (her power being able to manipulate matter at the atomic level apparently) and Hei was only seen with his hand outreach at the end so is Yin now fused with Hei like Pi
 3) Those 2 Doll Twins had the same kind of Specter that Yin had where instead of a blob they had a human from and they said they was going to a 3rd gate that has just appeared so what is the 3rd gate and why has it appeared after the first 2
 4) There's the unknown being that would be born which is probably that child that came out of the coffin but also there's a huge black monolith extending out of Hell's Gate so does it has a connection to the kid


I'm wondering if there is a continuation and what form it is in (anime or manga). Since most anime are adaptations of manga, does a manga continuation already exists? And if so, are there any plans to adapt it into an anime?
According to both Wikipedia and MyAnimeList, there has not been any sequel produced to Darker than Black: Ryuusei no Gemini. There is a 4 episode OVA prequel, produced after Gemini, Darker than Black: Kuro no Keiyakusha Gaiden, which fills in the gap between the first and second season.

There is also no continuation in any other form. Darker than Black was originally produced as an anime. There was a short manga adaptation, but it really only adapted the first season of the anime. There was, however, an original manga
continuation of that manga series, titled Darker than Black: Shikkoku no Hana. It is not an adaptation of Ryuusei no Gemini, but replaces Gemini completely.

To the best of my knowledge, there have not been any further announcements of other continuations of the franchise, and the most recent activity was over 2 years ago. It's certainly still possible that they intend to produce another series, but there is no news confirming any such intentions so it seems unlikely.