It is a feature that allows you to earn various rewards by deepening the Trust between certain characters.
You will need to play Shows and earn Trust EXP in order to level up Trust Ranks.
On top of Crystals and other various items, you can also obtain special titles for specific Character combinations, Show Call Out Voices and such as rewards by increasing Trust Ranks.
Furthermore, Trust Ranks apply to specific Character combinations. Combinations currently unavailable may be made available in the future.
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