masuyama kei, saten ruiko, uiharu kazari, toaru kagaku no railgun, toaru majutsu no index, 00s, 2girls, black eyes, black hair, bottomless, flower, green eyes, hair flower, hair ornament, head wreath, long hair, mouth hold, multiple girls, no pants, one-piece swimsuit, school swimsuit, school uniform, serafuku, short hair, socks, swimsuit, swimsuit under clothes, white one-piece swimsuit, white school swimsuit, yuri