Two anime girls, hisakawa_nagi and hisakawa_hayate, pose closely in elegant Tanabata-inspired costumes against a sprawling milky way galaxy background. Hisakawa_nagi, a girl with very long grey hair in low twintails with black ribbons, wearing a gyaru-style shirt, stands on the left holding her hands gracefully in front of her. Hisakawa_hayate, with very long grey hair in a braid, blue eyes, wearing a gyaru-style shirt and jewelry, stands on the right with one hand raised in a gentle wave. Their attire features flowing, star-adorned robes in light blue and ivory tones, resembling woven galaxy patterns, with long sleeves and bows subtly integrated into their outfits. The celestial backdrop is detailed with countless tiny glittering stars, glowing nebulae, and a majestic river of light stretching horizontally across deep space. The medium shot captures the sisters from a three-quarter angle, emphasizing their synchronized, smiling expressions and radiant poses. Soft, ethereal lighting washes over the scene from the cosmic backdrop, creating starry reflections on the girls' hair and clothing.