Here is a list of all quest items and consumable items in Re Destiny.
QUEST ITEMS
Usage: Unlock the Hidden Chapter in Act 2
How to get: Complete Chapter 5 in Act 1
Usage: Unlock the Hidden Chapter in Act 3
How to get: Random drop from Chapter 3 in Act 1
Usage: Unlock the Hidden Chapter 2 in Act 5
How to get: Complete the Hidden Chapter in Act 1
Usage: Unlock the Hidden Chapter 2 in Act 4
How to get: Complete the Hidden Chapter in Act 2
Usage: Unlock Chapter 0 in Act 4
How to get: Random drop from Chapter 3 in Act 2
Usage: Can be sold for 5000 Koban
How to get: Complete Chapter 0 in Act 2
Usage: Unlock the Hidden Chapter 1 in Act 5
How to get: Complete Chapter 0 in Act 3
Usage: Can be sold for 5000 Koban
How to get: Random drop from Chapter 5 in Act 3
Usage: Unlock the Hidden Chapter 1 in Act 4
How to get: Complete Chapter 0 in Act 4
Usage: Unlock Chapter 3.2 in Act 5
How to get: Random drop from Chapter 0 in Act 4
Usage: Unlock Aone’s Misson
How to get: Complete Chapter 5 in Act 5
Usage: Can be sold for 5000 Koban
How to get: Random drop from Chapter 2 in Act 6
Usage: Can be sold for 5000 Koban
How to get: Random drop from Chapter 6 in Act 6
Usage: Unlock Kuzunoha’s Misson
How to get: Complete Chapter 9 in Act 6
CONSUMABLE ITEMS
Usage: restores vitality
Usage: restores armor
Usage: restores magic shield
Usage: explode 1 negative gem
Usage: explode all negative gems
Usage: replace all magic gem with recovery gem
Usage: when taking fatal damage, revives player with 25% of HP
