Octopath Traveler 2 - Wellows Manor

This quest becomes available after you arrive at Merry Hills. There is a NPC there with a cursed music box, and you need to get the box from him. Once you have it, the spirits in the manor will appear at night and you can deliver the box to put them to rest. Then finally, the ghost of the little girl leaves a diary behind at the gazebo. Once you find it, you will learn what happened to the house...