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.

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