If you have "Creepy Kid, Aqua" and "Practicing Together, Ruby & Ai", choose up to 1 "Unshakable Center, Ai" in your hand, put it in any position of your stage, and that character gets the following ability until end of turn. " [CONT] During this card's battle, your opponent cannot play event cards or " Backup" from their hand." Put this card into your memory.