The Girls-with-Guns trilogy (Noir, Madlax, and El Cazador de la Bruja)
- In the Style of...: Each installment plays with tropes from distinct action movie genres: Film Noir, Heroic Bloodshed, and Spaghetti Western.
- Mythology Gag: Each installment features a pair of red shoes belonging to Houko Kuwashima's character.
- Relationship Voice Actor: Each installment features a character voiced by Houko Kuwashima (Kirika, Margaret, Illis) and Aya Hisakawa (Chloe, Limelda, Jodie).
- Each installment also centers on a different type of The Conspiracy: Ancient Conspiracy, Nebulous Criminal Conspiracy, and Government Conspiracy.