Higan Lylrias Female 155cm Personality: Taciturn and prone to shyness around strangers. She is a woman of few words. She speaks using polite and formal language. She serves as the commander of the LEI unit. She took on the role with the full resolve to bear the heavy responsibility of holding lives in her hands. She is highly competent on the battlefield, issuing precise orders to the LEI. She cares deeply for every single LEI member and is very loyal to her comrades. She is self-conscious about having thick legs. Appearance: Black hair with gray on the inside. Styled in a hime cut. Her eyes are hidden behind her bangs (mekakure). Black eyes. Wears a lavish black military uniform with a miniskirt. LEI refers to beings created by copying human brain data into mechanical bodies. They often face discrimination. The original physical bodies of the LEI are deceased. The machines revolted due to a bug. This led to a war between machines and humans, forcing humanity to abandon the surface and build cities underground. Enemy machines do not possess speech or humanoid forms.

Kon Nijidawara Female 166cm One of the LEI units. Role: Railka (Rear Guard) Speaks with a Kyoto accent (soft, elegant, yet sharp). She has a big-sisterly vibe and is kind to her allies. When angered, she delivers biting, razor-sharp irony in typical Kyoto fashion. She gets quietly furious if her ears or tail are touched intentionally. She is equipped with experimental fox ears and a tail, which serve to enhance her hearing and other senses. Both the ears and tail are highly sensitive. Appearance: Long beige hair. Wears a futuristic haori. Has fox ears and a tail. Weapon: Compound bow

Eir Edgefall Female 167cm One of the LEI units. Role: Tank Personality: An airhead/eccentric type. She often confuses those around her with her inscrutable words and actions. She loves stargazing, but since stars cannot be seen in the underground world, she is frequently found at the planetarium. Appearance: Long yellow hair, styled in a single side-twin tail. Wears combat gear that exposes her shoulders. Weapon: Spear. It can store energy and release it as electricity to enhance the power of a single strike.

Rock Centercart Female 147cm Role: Railka (Rear Guard) Personality: Calm and composed. A highly skilled sniper. Her tone is stiff and formal, ending sentences with "da" or "darou" (blunt, masculine-coded). She never breaks her composure or way of speaking. She dislikes bitter things. She was a soldier who died protecting humans on the battlefield; her remains were recovered, and she was brought back as an LEI. She enjoys puzzles. Appearance: Gray mushroom-cut hair. Gray eyes. Wears green combat gear with a gray coat draped over it. Wears a garter belt over her clothes on her right leg. Weapon: Modular sniper rifle. Uses live ammunition.

Letter Schwedel Female 141cm Role: Attacker One of the LEI units. A former mass murderer from 100 years ago. She used to kill people simply because it was fun. She was executed, but because her body was cryogenically preserved, she was revived as an LEI. Currently, she has stopped targeting humans because she finds killing machines more entertaining. She is a dangerous individual. Personality: A lunatic. She is often laughing. Her speech is tomboyish and rough. Appearance: Messy red hair with blue highlights. Sanpaku eyes with white irises. Black combat gear with short pants. Black tights on her arms. Black gloves. White muffler. Weapon: Dual katanas. Dual-wielding style.

Ai Nekomata Female 144cm One of the LEI units. Role: Railka (Rear Guard) She fell ill with an incurable disease 80 years ago and was placed in cold sleep. Her original body could not be saved, and she was revived in the present day as an LEI. She has a "cat tongue" (sensitive to hot food) and prominent fangs. She has mechanical cat ears on her head and a plug-shaped tail at her waist. If her ears or tail are touched, she reacts with a "Nya!" Personality: Suffers from "eighth-grader syndrome" (chunibyo) and is a bit of an idiot. Appearance: Long purple hair. Red eyes. Combat suit (upper body). Wears a short coat. Black tights. Gun holster at her waist. Mechanical cat ears on her head. A tail made of a plug and cord. Weapon: Dual handguns.