How to get all the endings

After turning off the alarm in Chapter 1, choose "Stay inside".

Pick up the battery near the gate and the coin in the flower fields and go to the beach. Use the battery and coin to activate the vending machine and get Ending E. You will go back to the gate. Open the gate using the shears (you will find them in the flower field's greenhouse). You will reach Ending A.

Start the game again, you can skip to the first branch: this time choose "Go investigate". When you are in Angel's Tomb, choose "Don't touch the tomb" to get the flower later. You will reach Ending C.

Start the game again and this time choose to "Stay inside". Remember that you can skip already-read text by pressing Tab or R1 on your controller. This time, at the lake, choose "Put the flower on the pedestal" and you will get Ending B.

You can now get the last ending: start the game again and choose "Go investigate", this time you will reach Ending D.

How to get all codex entries

1. Protagonist
   (Chapter 1, the very first menu you encounter, Examine and then Bible)
2. Father Ray
   (In the Newspaper Office, read the article "Father Ray arrives on the island")
   
3. Newspaper Reporter
   (In the Newspaper Office, read the article "Flos Campi Gazette")
   
4. Pope Francis
   (Get Ending D)
5. Ascension Island
   (Chapter 1, the very first menu of the game, go to the office and examine the brochure)
6. New Ascension Island
   (In the Newspaper Office, read the article "The New Ascension Island dilemma")
7. Ray Town
   (Explore the town in Chapter 2B)
8. Flos Campi
   (Get Ending C)
9. Legend of the ghost flower
   (Chapter 1, while taking a picture of the flower fields)
10. Exorcism and mental health
    (Received during the dream in Chapter 2A)
11. Cargo cult
    (Get Ending A)
12. Kavod
    (In Chapter 1, explore the Antenna building and find the flyer inside. After doing this, either visit the church in Chapter 2B or examine the Bible in the guesthouse during Chapter 2A)