A school of luminous orange and white koi fish swimming upstream in a crystal clear mountain stream during autumn, vibrant red and amber maple leaves floating on the gentle water current, soft morning sunlight filtering through colorful autumn foliage creating dappled light patterns, smooth moss-covered stones lining the streambed, small cascading waterfalls in the distance, traditional Japanese stone lantern partially submerged nearby, hand-painted watercolor background with warm amber maple and cool jade stream tones, cel animation aesthetic with crisp clean lines, peaceful harmonious mood, Studio Ghibli inspired artistic style