Item from [[Girls' Frontline]] which can be exchanged for furniture, or costumes. Obtainable by gifting a costume on a doll who already received the costume before. This is obtained most frequently through resupplies (Gacha pulls for simultaneous chance of a costume or furniture piece) in the dorm.

As the name suggests, it is a black card. It has a purple/pink gradient strip close to the bottom, and a triangle with a pair of dots resembling a face close to the top.
black card (girls' frontline)