1girl, arm support, arms behind head, bikini, black hair, groin, haruyama kazunori, hitou nami, navel, sanosuke, sayonara zetsubou sensei, solo, swimsuit, translated, underwater
1girl, arm support, arms behind head, bikini, black hair, groin, haruyama kazunori, hitou nami, navel, sanosuke, sayonara zetsubou sensei, solo, swimsuit, translated, underwater