An international release of these versions was carried out by the publisher PQube.
Gal Gun: Double Peace was released on PlayStation 4 and PlayStation Vita in Japan on August 6, 2015, by publisher Alchemist.
This is exclusive to the PC and PlayStation 4 version of the game. This is reserved for when someone walks into the room, and the player feels the need to hide the subject matter of the game. Activating this will make the game have the layout and aesthetics of an RPG. Like the first, Double Peace features a "Mom’s Arrived Screen". If shot, they can be interacted with, and the player may experiment to see if they are his destined lover. There are over seventy girls in the game, all of which contain specific endings. The differing routes allows the player to select what stage they'd like to play from an ordered list (in order to play stages the player passed on, a new game must be started) whilst the dialogue ranges from statements of love to perverted remarks, and these all allow the player to either straighten a girl's affection for Houdai or dwindle it, depending on her tastes and what is said. The title features branching paths and dialogue trees. These requests can be viewed in between levels, and are usually completed by collecting a certain hidden item within a stage. All currency is gained by completing levels or specific requests from other students. Donations can also be made to Aoi, which will unlocking her secret ending if enough are made. Items here can be purchased, including increased player stats, more powerful shots and new camera angels for Doki-Doki mode. It is run by Aoi, a female musician at the school who isn't affected by Houdai's cupid condition. Items such as character profiles, cosmetics or other school girls to subdue can be found behind certain hidden walls, as well as decreased cover for female students to hide behind. Zooming in also allows the player to see through invisible walls. Both of these serve as a mean of gaining the player a more accurate shot. Holding the right shoulder button allows the players reticule to be zoomed in, with the left shoulder button serving as a method of slowing the sights down. Kurona's cursed girls are more difficult to subdue, requiring the player to first shoot a mini demon angel that hovers around the infected girl before the female student may be shot with a pheromone shot. "Doki-Doki Mode" makes a return, effectively breaking up the gameplay and preventing tedium. This is done via the PlayStation 4's touchpad on the controller, or the screen on the Vita. Specific sections will also require the use of touch or swipes. Unlike the original, the PlayStation Move is not supported in the home console version. The player may use the analog stick to shoot the classmates. If the player shoots the girl, the pheromone shot will give them euphoria, subduing them in the process, thus preventing them from confessing their love feelings to the player that will damage player's HP if they succeed.
The player fends off waves of female classmates using the pheromone shot, a power granted to the protagonist Houdai via the cupid Ekoro. Gal Gun: Double Peace is a rail shooter bishōjo game. The game features branching paths and multiple endings. They aren't affected by Houdai's curse due to a hidden profession as demon hunters, the sisters spend the game hunting Kurona, whilst also rekindling a bond with Houdai, whom they have not spoken to in three years.
The sisters Shinobu and Maya, who are the students at the academy and childhood friends of Houdai are also relevant to the plot. Due to unintended side effect caused by increased dose of the shot, Houdai will face a life alone if he doesn't find his "True Love" girlfriend before the sunset. At the same time, the aforementioned demon angel is striking girls with her staff, which makes the girls love Houdai in a more physical fashion, which includes injuring him in a fashion similar to bondage. This makes every girl at the school grow madly in love with Houdai, frantically running after him in an effort to claim him as their partner. In an effort to strike the target first, Ekoro accidentally increases the dose of the arrow by thirty-two times the original intended amount. However, Ekoro notices that Kurona, a demon angel who is also doing a practical exam, has the same intended target of Houdai. The target is protagonist Houdai Kudoki, an unpopular male student at the academy. A student cupid angel, Ekoro, has to strike a student with a love arrow during her exam, which will help the student find the love of her life. The game takes place in a fictional academy in Japan, named Sakurachi Academy.