shiotsuki kazuya, izutsumi marin, izutsumi minato, roboko (ninkoro), ninja to koroshiya no futarigurashi, official art, 2girls, @ @, arm support, back-to-back, blue hair, blue skirt, blush, bright pupils, brown eyes, clenched teeth, coat, cover, ear piercing, earrings, glasses, hair ornament, jewelry, lab coat, long hair, multiple girls, open mouth, piercing, pleated skirt, robot, round eyewear, sailor collar, sharp teeth, siblings, sisters, sitting, skirt, skull hair ornament, smile, teeth, twintails, white coat, white pupils, white sailor collar