軍事機密だ is a Weiß Schwarz card from ご注文はうさぎですか？？ ～Dear My Sister～ GU/W57-070. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
【AUTO】 When this card is placed on your climax area from your hand, choose up to two of your characters, and those characters get +2000 power and +1 soul until end of turn.