3girls, armband, artist name, black hair, blue skirt, blunt bangs, brown eyes, closed mouth, color trace, crossover, dated, dominator gun, green armband, gun, handgun, hands on own chest, head wreath, holding, holding gun, holding weapon, multiple girls, multiple views, neckerchief, own hands together, pleated skirt, red neckerchief, sakugawa school uniform, school uniform, science fiction, serafuku, signature, sketch, skirt, smile, solo focus, standing, straight-on, summer uniform, tokiwadai school uniform, trigger discipline, upper body, upturned eyes, w arms, weapon, white background