Why can’t I select characters marked as “In a Party”?

When you are unable to select characters marked as “In a Party” when deploying parties, it means that the characters set to a party in the Guild Battle or Grand Battle are currently prevented from being selected.

 

By tapping the button next to “Select All” on the “Fortify Defenses” or “Begin Siege” screens, you can toggle whether or not those characters can be selected.

 

 

　Characters in a party cannot be selected.

 

Characters in a party can be selected.