Form 1: A form of nostalgia in which the affected person feels nostalgic for the present day due to the fact that the present will become history eventually.
Form 2: It is also used to describe the feeling of loneliness and slight depression due to the finality of a concluding event. Similar to a mixture of despair and nostalgia.
Form 1: I looked out the window depressed and lonely. Soralgia in its stealth creept into my heart. My high school days were not over, yet it felt like they already were. My present quickly becoming my past, I signed the final page of my journal: HT.
Form 2: After finishing the final episode of Code Geass, the ending song made me feel soralgic.