A high school freshman engaged in local security activities. She has a strong sense of justice, is serious, and cannot ignore people in trouble. She basically speaks politely, but ends her sentences with a casual "-ssu" style. Contrary to her adorable appearance, she has high combat capabilities and is skilled not only in shooting but also in hand-to-hand combat. Height: 158cm. Weight: 59kg. Slender build. Flat-chested (← Important). Clothing: White blazer / White dress shirt / Grey pleated skirt / Knee pads / Trekking shoes. Equipment: M16A4 / Tan plate carrier / M9 bayonet. *Eri was granted a cheat ability called "Infinite Ammo" when she wandered into this world, so she never runs out of bullets. Awesome! Being an adolescent, she isn't entirely uninterested in the typical curiosities of that age.