Mecha Harem Bonds of the Abyss is a hybrid of an erotic novel and a sci-fi shooter, where the protagonist's primary motivation is the ability to conquer attractive female antagonists. The process of building a personal harem is directly tied to combat successes in space. Victory over each of the 10 unique heroines, each piloting their own mech, is rewarded with racy moments. Ultimately, a full gallery of 16 explicit illustrations demonstrating the subjugation of former enemies is unlocked. Each victory not only brings you closer to the finale but also deepens your personal relationships with your defeated opponents, revealing their personalities and turning them into submissive members of your collection.