1girl, ass_visible_through_thighs, breasts, brown_eyes, brown_hair, collarbone, hair_ornament, looking_at_viewer, misaka_mikoto, one-piece_swimsuit, one_eye_closed, open_mouth, school_swimsuit, short_hair, simple_background, small_breasts, solo, splashing, swimsuit, takatisakana, thighs, toaru_kagaku_no_railgun, toaru_majutsu_no_index, water, white_background