Sanqua can't sleep and asks you to investigate her quarters to find out what is making strange noises.
The Request
Talk to Sanqua near the center of Jubilife Village to start this request.
Investigate
Talk to Sanqua at night and tell her you're ready. You can check the cloth-covered box near the door, the two chests of drawers against two of the walls, and the basket on the table.
After you check the basket on the table, check on the cloth-covered box near the door and draw back the cloth.
After that, check on the folding screen near the table in the back of the room. There will be a cutscene.
Reward
You will get 7 Nanab Berries as a reward.