original
i-68 (submarine) (personification), i-69 (submarine) (personification), i-70 (submarine) (personification), taigei (submarine tender) (personification)
bulge tsuki
1girl, 3boys, black eyes, blush, brown hair, clothes lift, flag, glasses, gun, i-68 (submarine), i-69 (submarine), i-70 (submarine), imperial japanese navy, japanese flag, long hair, looking back, mecha danshi, mecha musume, military, multiple boys, o_o, ocean, open mouth, panties, pantyshot, personification, ponytail, rising sun flag, ship, skirt, skirt lift, submarine, sunburst, surprised, swimsuit, taigei (submarine tender), underwear, wading, water, watercraft, weapon, world war ii