Voices

During the first day once you wake up in Hour 2 the phone will ring and you'll be talking to Miku. In the background you'll be able to hear muttering as if someone else is on the phone. You may be able to make out what their saying. (You'll notice the cat on your couch again)

Don't Sleep Yet

On the first night during Hour 2 were you get to go to sleep, don't. Instead go back into Miku's room and just keep talking to her. Rei should give her pictures to research and Miku will tell her it's raining outside again after that.

Thick Miasma

When you're far in the game, you will encounter a scene where Kei says he feels weak. After that scene, you will recognize that the screen is monochrome. When it's monochrome, you will have more encounters with the tattooed priestess, Reika and you will become a little vulnerable when you have hostile ghost encounters. To stop the screen from turning monochrome, always have a purifying candle in hand.

Defeat Last Boss Instantly

To defeat the Reika, the last boss, use type 0 or 90 or 61 film. Just be careful and avoid her attacks when she's vulnerable because if she touched you, you will die unless you're carrying a stone mirror. It might take a while because Reika will keep on repeating her attacks.

A Ghost In The House

Check every night during Hour 1. On the night that you see your assistant is not in her room but downstairs she'll tell you something and then tell you that its raining outside. Then check and click on at least one thing in every room of the house. Start in Yuu's room and end in the dark room. when you walk back to the living room your controller will vibrate and you'll see a dark figure of what seemed like a girl or young woman in the doorway to that room with the little shine thing for Yuu for only a brief moment. (You'll also notice that there is a cat on the living room couch.)