There were several ways to obtain Ardent Soul Points:
1. Level 90 and above Elite monsters randomly enter, three times a day. Each time, you can obtain 2 Ardent Spirit Points. You can obtain 180 Ardent Spirit Points every month.
2. Weekend AFK Farming Event. Earn 32 Ardent Spirit Points per week.
3. Elu's Treasure. Earn 5 Ardent Spirit Points per week.
4. Various uncertain activities, you can get dozens of Ardent Soul Points every month.
5. It was a free upgrade.
6. He bought it from the shop.
The above was the answer based on the search results provided.
I'm not entirely sure as I haven't played it myself. But generally, a visual novel often has a story - it could be about the character named Dexter and his adventures, relationships, or a particular journey in a fictional world.
Love and relationships are often common themes. Maybe the characters in the 'ardent aspen' story have complex emotional bonds that are explored in the fanfics.