It's interesting, the comment that the progenitor made: "Is that how you see this place in your eyes?". So whether the path to the Underworld is as beautiful as heaven or as gruesome as supposedly so varies from person to person? Could it be individuals' states of mind (of when they were alive) that render different visions. I wouldn't attribute it to good or bad karma, because if it comes to that Shirogane, who had sunk the entire village, wouldn't have conceived such a heavenly sight. He was in love before he came here and actually came here because of love. His intent was so pure that he woke up in a realm as pure as his heart?