“大好き”の証拠 is a Weiß Schwarz card from D.C.III～ダ・カーポIII～ DC3/W18-039. 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, draw a card, choose one of your characters, and that character gets +2000 power and +1 soul until end of turn.