Oreille had some kind of plan which involved making copies (not sure about this). They were in room with a big pink glowing thing.
There were two Yins. The black one was a copy apparently.
Oh hello, Mr. Magician. He has a short talk with July inside the gate. Suou finds them, and after the talk July takes her to Shion and dark Yin.
Shion looks withered, I wonder what happened to him in the first half (and how he got to the flower garden). The twins talk for a while, then Shion dies. Suou wants to shoot dark Yin, but then dark Yin somehow breaks Suou's meteor fragment. I don't get the next part (it seems the meteor fragment holds Suou's memories? or was that just a "life-passes-before-my-eyes" thing?).
Was that
Amber there near the climax (when Misaki was running into the neutral space and saw a vision-like scene of Hei + Suou and July on the ground + a person confronting Hei)? She seems to be doing the same pose back in last season's final ep (giving/pushing the meteor fragment onto Hei).
Epilogue: Either Shion's copying power was used extensively, or that was some kind of alternate reality for the diseased held by dark Yin (Well, when the CIA approached her they had their "observer spirits" removed and sucked into Yin. I guess normal people have observer spirits too, only dolls can control them better.). Hell's gate is now safe to enter it seems, and I think the sky is back to normal? Well, I swear I saw a moon there somewhere, or maybe it was my crappy video quality.
Also, Genma died. He was killed by Hazuki. As for Hazuki, I failed to catch her in the epilogue.