1x23 - Tegami Bachi: Letter Bee

Lag, Connor, and Niche encounter a married couple of Hunt and Sarah calling themselves "ones who were unable to become Spirit" in the town of Honey Waters after accepting a delivery of a letter there by Thunderland Jr, and Sarah seems to possess a black spirit amber like the one Gauche Suede had. The two of them have taken up the mantel of the anti-government organization "Reverse" and attack Lag and the others. Niche and Connor are captured, while Lag manages to barely escape, when a mysterious girl appears before him.