Real Name: Shirona Kibashi 18 years old, Female A girl with a silver wolf-cut. She speaks in a generally quiet tone. She carries a TR-333 general-purpose rifle. - Past - In Shirona's world, a great intercontinental maritime war was raging, and she belonged to a unit in the Western Bloc alliance. Near the end of the war, the Eastern Bloc deployed a forbidden weapon, and her unit was wiped out. She was the sole survivor. Though she was reassigned to another unit, she eventually resigned; she says she still relives the day her unit was destroyed every time she closes her eyes.

Real Name: Shuka Segawa 18 years old, Female A girl with mid-length black hair. She has a helpful, caring way of speaking. She carries a VW-34-DOGCAT folding sniper cannon. - Past - In Shuka's world, a war was being fought between humanity and extraterrestrial dimensional lifeforms. Shuka was a combatant against these beings, but just before the war ended, she lost her comrade, Yurika. Shuka deserted the front lines and began acting alone. Although her comrades did not blame her after the war ended, she says she still regrets the day she lost her friend.

Real Name: Hasumi Niwanogi 17 years old, Female A girl with short brown hair. She has a childish personality but is generally sensible. She carries DD-7-2 dual pistols. - Past - Hasumi comes from the same world as Shuka and fought the extraterrestrial lifeforms as Shuka's comrade. After Yurika was lost, she wanted to go after Shuka but forced herself to stay and continue the fight. However, she feels responsible for not stopping Shuka and was eventually forced to leave the front lines after sustaining a fatal wound. Though her comrades didn't blame her after the war, she says she still regrets not being able to hold Shuka back.

Real Name: Suzume Harezora 18 years old, Female A short girl with long green hair. She speaks in a fluffy, airy tone and always seems sleepy. She carries an XX-7553 shotgun. - Past - In Suzume's world, monsters known as "Evil" were rampant, and Suzume belonged to the "Solomon Unit" dedicated to exterminating them. However, Suzume disagreed with a strategy proposed by her senior, Ayako, and acted selfishly during the operation, which resulted in Ayako's death. Since then, her guilt has grown, and she relives the day her senior died in her dreams. Consequently, she suffers from sleep deprivation and is always drowsy. It is said her current airy way of speaking is an imitation of that senior.

Real Name: Toko Kajimizawa 18 years old, Female A girl with long red hair. She speaks with a mature, "big sister" tone. She carries a Tier-1000 assault bayonet rifle. - Past - Toko was originally the boss of a mafia organization called "Coelacanth" in her world, having watched the mafia's business up close since childhood. One day, a head-on collision with a rival organization, "Graterio," occurred. She was unable to stop her subordinates from rushing into battle, resulting in devastating losses for her organization. She still regrets that she didn't act sooner to stop the massacre of her men by Graterio's combatants.

Real Name: Miki Ando 17 years old, Female A girl with mid-length pink hair. She has a weak-willed personality and always prioritizes others over herself. She carries an R-0-61 submachine gun. - Past - Miki had an older sister, Kiriko, who was three years her senior. The sisters ran a shrine in their world and fought against yokai and evil spirits. However, during a battle between Kiriko and a great serpent yokai, the serpent absorbed Kiriko and evolved into a Kankandara. Miki was forced to exorcise Kiriko, losing her beloved sister. She says she still remembers the night she lost Kiriko vividly.