アッシュアームズ-灰燼戦線- is a beautiful girl x military simulation RPG set in a world on the brink of extinction due to a 200-year invasion by mysterious enemies known as "災獣(リセッター)". As an agent appointed by the "灰燼教会" - the ruling power in the last human stronghold, the fortress city "City(シティ)" - you will lead human-made lifeforms called "DOLLS", which are personified tanks, combat aircraft, and other weapons, to fight against the long-standing enemies of humanity, the "災獣(リセッター)".

The game features a captivating storyline where girls with the mission to fight from birth weave a tale of counterattack. Players will engage in battles with the "災獣(リセッター)" using the various real-life weapons, such as tanks, tank destroyers (TD), anti-aircraft guns, combat aircraft, ground attack aircraft, bombers, and reconnaissance aircraft, all personified as young girls.

The game boasts a talented voice cast that brings life to the unique and diverse DOLLS who fight on the smoke-filled battlefield.