Its finally revealed that FB was Mr. Braun all along. He wrote his text messages like a women in order to trick Moeka. Because she and himself are no longer needed since they completed their mission, he shoots Moeka and himself. Moeka also briefly remembered the things she did in past timelines, and apologizes to Okabe for everything.
The IBN5100 is back in Okabe's hands, and just when he thought its all over, he realizes that he has to sacrifice Kurisu in order to save Mayuri. Who will he choose?
For those wondering about a Moeka end, there is no ending for her. Also, this episode had a major deviation from the VN.