The following details come from the Rice Digital website:

Gal*Gun Double Peace is a railgun shooter that does away with zombies or groups of mercenaries. Instead, trek your way through a bright and colourful academy, fending off your fellow female students! Why? Because they all want a piece of you. You’ve been struck by a cupid angel and have become irresistible to everyone. You need to fend off love letters and kisses, battling your way through to find your true love by the end of the day, or face dire consequences. Shoot the advancing students and teachers with your “pheromone shot” to fend them off!