It depends on your preferences. Some people might find it amazing due to the rich story and immersive world-building, while others might have different opinions.
It's hard to determine a single best story quest. 'The Story of Klee' is popular among many players for its charming and light-hearted narrative. Different quests appeal to different people based on their interests in the game's world and characters.
It varies. Some character story quests can be completed in a couple of hours, while others might take longer depending on your playstyle and exploration.
I'm not entirely sure specifically as there could be many different 'princess guard archon visual novels'. Generally, it might involve a story about a guard protecting a princess in a world with archon - related elements, perhaps with elements of fantasy, adventure and character relationships.