kantai collection, ro-500 (kantai collection), u-511 (kantai collection), hiten goane ryu, hiten (hitenkei), simple background, white background, monochrome, 2girls, covered navel, :d, female, flower, garrison cap, hair between eyes, hair flower, hair ornament, hat, holding hands, interlocked fingers, long hair, looking at viewer, multiple girls, open mouth, school uniform, serafuku, smile, sukumizu, swimsuit, symmetrical hand pose, upper body