Trust is tied to each character and can be raised by completing missions tied to the relevant character.
Raising Trust earns you various rewards.
Select a character to view their Profile and Trust Missions.
■ Profile
You can check each character's information and listen to their voiced lines.
■ Trust Missions
Details, progress, and conditions for character-specific missions can be checked here.
Each character has multiple Trust Missions.
By meeting the conditions, you can obtain Trust EXP as well as items, voiced lines, Titles, and more.