兄さんになった日 is a Weiß Schwarz card from D.C. Re:tune ～ダ・カーポ～ リチューン DC/W128-071. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
Choose up to 2 characters with "Nemu" in its name in your Waiting Room, add them to hand, then discard 1 card. Send this to Memory. (1) If you have 6 or more CXes with a Door Trigger in your Waiting Room, you may pay cost. If you do, shuffle all cards from your Waiting Room into your deck, then draw 1 card, and discard 1 card.
This card was printed in Japanese only; the English text above is an unofficial community translation.