Not sure why some people think grinding in games is suppose to give the illusion of content as its normally used to space out little content. While this game does have stuff it seems the grind makes it rather just annoying to play most of the time. As for the game itself it doesn't seem like their is an over arching story so its most-likely a endless adventure until they want it to end it as it hasn't even been hinted were this is going. Kind of odd that Rose's snowball and firefly potions are more valuable than most of the loot in the entire game with the snowball potion being the better of the two.
As for the Night Guest, it seems simple not sure if sleeping in the home stops it from working but after 3 days you just keep chatting until Carla say it, hold alt if its repeated text, then check houses with males in it at night which there are only 3 outside of Krowly - Eric, Derek and the old man, Sebi owns the only lock in town so he most likely never gets drained.
As for the Night Guest, it seems simple not sure if sleeping in the home stops it from working but after 3 days you just keep chatting until Carla say it, hold alt if its repeated text, then check houses with males in it at night which there are only 3 outside of Krowly - Eric, Derek and the old man, Sebi owns the only lock in town so he most likely never gets drained.