"湮滅邊界線" is a turn-based strategy game set in a fictional world featuring girls and mechs, emphasizing character development and battle tactics. The game unfolds in a parallel world with a near-modern background where humanity, united after past conflicts, faces the sudden appearance of the malevolent mechanized legion, "Borderline." To combat this threat, girls equipped with special exoskeleton mechs rise as a crucial resistance force, projecting a united front against the invaders.

The gameplay introduces innovative elements to traditional strategy games, focusing on a fast and convenient mobile experience. With a combat system inspired by various military units across land, sea, and air, the game offers hundreds of diverse levels with rich weather and terrain environments, incorporating colorful mechanics to enhance challenge and replay value.