"This morning, I shot six holes in my freezer. I think I've got cabin fever. Somebody sound the alarm." Jimmy Buffett - Boat Drinks
Shii's breakdown in Koguma's apartment reminded me of this old song. While Shii was a lot less violent than Jimmy, they're both expressing frustration with a seemingly unending winter. Both have the same solution to their problem: Travel south, which leads to another Jimmy Buffett song, Changes in Latitudes, Changes in Attitudes. As they make their journey, they'll see nothing remains quite the same.