A Build Divide Demon Slayer booster box is a collectible trading card game product by Aniplex, containing cards from the popular anime series in Japanese. Each box contains 16 booster packs, with each pack holding 7 cards. The sets include characters from various arcs of the anime, with rarities like Divide Rares (stamped with the Demon Slayer logo) and parallel types to collect. 
Booster box contents and features
Manufacturer: Aniplex
Language: Japanese
Game: Build Divide TCG (Trading Card Game)
Anime: Demon Slayer: Kimetsu no Yaiba
Box contents: 16 booster packs per box
Pack contents: 7 cards per pack
Card size: Standard 63 x 88mm
Total card types: Approximately 56 standard cards plus parallel types (78 planned for the set)
Key features:
Features characters and scenes from the anime
Includes a variety of rarities, with special hologram and parallel versions
Includes unique "Divide Rare" cards with the Demon Slayer logo stamped on them, which are not guaranteed in every box