Also known as: 路地裏同盟
The Back Alley Alliance (or After-school Alleyway Alliance in other translations) is a comedy trio from Carnival Phantasm composed of Yumizuka Satsuki, Riesbyfe Stridberg and Sion Eltnam Atlasia. In each episode of Carnival Phantasm, the trio will appear where Satsuki talks about a certain topic, Riesbyfe gets distracted and derails the act, and Sion confuses them all by claiming the entire event was all within her calculations.
Also see "Houkago Rojiura Doumei!", the Double Finger Gun gesture they do when saying their catchphrase.