Walkthrough - Day 7

Main Plot
Talk to Saxon and say you'll participate to gain access to the final dungeon, the Cradle. Enter the Cradle and head to the far-bottom-left. Defeat the Indecent One. Return to town and talk to the informant.

Choose "What should I do?" for True Ending 1, and "No..." for True Ending 2. For True Ending 1, go to the house of the person you chose as your partner and do as instructed.

(The password in True Ending 1 is for the mailbox in the gallery. It contains a supply of helpful items for repeat playthroughs.)

Your Fault (Day 7 Only)
Talk to the warehouse owner on Dragons' Peak. Guilt +5.

Collapse
Seaside and Dragons' Peak are warped on Day 7, though besides the guilt event, there isn't much in them.

The Book Graveyard
Requirements to enter the bonus dungeon, the Book Graveyard, on Resort Island: 1. Have 40 or more Guilt Points. 2. Have cleared the Tower (above the Guide-Selling Old Lady's house). 3. Come on Day 7 before night. 4. Enter the password from True Ending 1. Guide for the puzzles in the Book Graveyard: The Worker's Apron in a present box on the way upstairs is the "refined apron" the Fashion Magazine likes. Equip it on Russell and talk to her to access a special shop.
 * One room has a book with a heavy Dictionary on top of it. Push the chair over to it to take the Dictionary.
 * Backtrack and enter the earlier door to the room with three shelves in the wall. Push the chair up to the high-up middle one, then put a character 5'4" or taller in your party to get their help.
 * Take the Small Key that falls outside to unlock the door further in.
 * Talk to the monkey to the left. Go to the right to get the Beer Bottle, then go back to use it on the monkey.

Bonus Room
Beating the boss of the Book Graveyard gets you the 0 & 1 Compass. After using the compass, re-enter the building where it used to be to visit a bonus room.