A nostalgic Japanese summer countryside scene from the Showa era, a gentle wide river flowing from lush green mountains, crystal-clear water with visible river stones, sparkling sunlight on the water surface, terraced rice fields with vibrant green rice plants, a quiet rural village nestled at the foot of the mountains, traditional Japanese houses, deep green forests, clear blue sky with soft white clouds, peaceful and idyllic atmosphere, natural colors, highly detailed landscape photography, ultra realistic, cinematic composition, summer light, calm and serene mood, Japan rural scenery, 8k, masterpiece