Folklores
Dispel the mist at the cost of your Sanity and find the Clock Tower to start a new day.
Challenge Advent of Folklores to obtain Chests of Folklores.
Mistville "Residents" will appear in the stage when "there are Mistville 'Residents' paying you a visit in this stage." Defeat them to get their eyes, which can be used to gain Infection Progress. You will be able to visit Mistville upon reaching a certain Infection Progress.
After entering Mistville, you will interact with a Lantern to start your exploration, during which you must dispel the mist at the cost of your Sanity and find the Clock Tower to start a new day. When your Sanity has been exhausted or you have survived 15 days, the current round will be over.
On odd-numbered days. You can interact with the Clock Tower to enter the Advent of Folklores gameplay. Completing an Advent of Folklore will allow you to get rewards from a Chest of Folklores.