When you arrive at your aunt's house, head up the stairs and turn left. Enter the first room on the northern wall to find the guest room.
You don't need to do anything here just leave after you entered, then head back downstairs to trigger the phone ring.
On the first floor head for the eastern wing and enter the last door on the upper right to get to the dining room.
Answer the phone which is near the wall clock, then head back out into the hallway.
Turn left and enter the very first door on the eastern hall near the potted plant. A cutscene will start, then leave the bathroom and attempt to go up the stairs to receive the very first key.
Now climb up the stairs and go inside the guest room. Interact with the bed to go to sleep and move on to the first night phase.
Miki will wake up thirsty. Head down to the first floor, then go to the east wing and enter the door right beside the door that leads to the dining room (second door from the right).
Inside the kitchen interact with the sink to start another cutscene, then leave the kitchen and head back to the second floor.
As you turn towards the west, the door on the easter wing on the second floor will fly open. Approach it and enter into the newly opened room.
Inside the room, examine the dark stain on the floor near the knocked over chair.
Then examine the bookshelf on the far right side. You must examine that bookshelf's right side to find a note. Now save your game and leave the room.
Attempt to enter the guest room and a monster will appear from the eastern wing. This is a chase scene, I'm sure you've noticed the numerous cabinets inside the house. Your job is to find the correct hiding place to stay in until morning. That monster will also chase you around the house.
Miki will attempt to escape into the bedroom, but that monster will follow you putting you in a tight spot. To flee from it, go around the table and out the door. Don't walk too fast though as the AI for the monster is pretty smart and will cut corners to get to you.
Once you're outside the guest room, head down to the first floor and enter the first door on the eastern wing to get to the bathroom.
Inside the bathroom head for the cabinet on the far right side and hide in there to stay safe until morning.