Someone commented below that they thought there was a one shot but even they were not sure. It's sad that there is nothing more. It's not the fact that it didn't end with Natsume recovering his sight; it's the fact that his lover wonders "will I be dragged into darkness with him?" and that leaves a feeling of uneasiness. It doesn't satisfy as a happy ending because it hints at something going wrong. If it had been a simple ending with them in each other's arms, in a normal setting, it would be fine, because I think the story was hinting at Natsume recovering his sight because he could see lights and shadows.
Someone commented below that they thought there was a one shot but even they were not sure. It's sad that there is nothing more. It's not the fact that it didn't end with Natsume recovering his sight; it's the fact that his lover wonders "will I be dragged into darkness with him?" and that leaves a feeling of uneasiness. It doesn't satisfy as a happy ending because it hints at something going wrong. If it had been a simple ending with them in each other's arms, in a normal setting, it would be fine, because I think the story was hinting at Natsume recovering his sight because he could see lights and shadows.