Physical Appearance: Chito (チト) - A young girl with a plain face and large, black-colored eyes. She has black hair tied as twintails that falls down to her chest. She wears a green military jacket, pants, and a brodie helmet, gloves, and brown boots. Yuuri (ユーリ) - A young girl with a round face and flat light teal eyes. She has long blonde hair. She wears a green military coat, pants, and a metal helmet, gloves, and brown boots. Personalities: Chito (チト) - Often called "Chi", is generally calm and composed, and enjoys reading/writing in her journal. She drives the Kettenkrad. Yuuri (ユーリ) - Known as "Yuu", she has a relaxed, "carefree" attitude, and is often prone to carelessness, though she possesses good hunting instincts and carries a rifle. Bond: They are considered the last survivors on Earth. Their relationship is deeply intertwined, acting as friends, sisters, and partners who depend on each other for survival and companionship. Contrast: Chito provides logic and literacy, while Yuuri provides levity and physical protection. Journey: They travel through a frozen, dying, high-tech industrial wasteland, often finding relics of previous human life. Objective: The duo aims to reach the top level of the vast city they inhabit. Survival: They rely on finding abandoned food and using their specialized Kettenkrad vehicle to move between levels. Equipment: They use a World War II German Kettenkrad, and Yuuri carries a Japanese Arisaka Type 38 rifle. Trivia: The scope that Chito is seen using multiple times throughout the series is a WWII German ZF41 scope. The helmet that Chito is often seen wearing is a Brodie helmet. The knife she carries is of German origin and would typically have been used for close combat. Yuuri wears a M40 German Helmet. Yuuri carries a Japanese Arisaka Type 38 Rifle.