There are 100 cards and 30 parallels in the Weiss Schwarz: That Time I Got Reincarnated as a Slime set. Booster boxes inlude 20 packs, with 8 cards per pack. Look for signed cards by Miho Okasaki (Rimuru), Yumiri Hanamori (Shizu), Sayaka Senbongi (Shuna), M.A.O (Shion), and Rina Hidaka (Milim) randomly inserted in booster packs. Every booster box includes 1 of 5 different promo cards.