A Japanese Weiss Schwarz: The Quintessential Quintuplets booster box is a sealed product containing packs of trading cards from the anime/manga series. The standard box contains 16 packs with 9 cards each, while some versions, like the Premium Booster Box, contain 6 packs with 3 cards each. These Japanese boxes feature cards with Japanese text, including the original release's 144 cards, and often include a guaranteed autographed card from one of the voice actresses. 
Standard booster box
Contents: 16 packs per box
Cards per pack: 9 cards
Total cards per box: 144 cards
Language: Japanese
Release: This is the original, standard release from 2021 
Premium booster box
Contents: 6 packs per box
Cards per pack: 3 cards per pack
Features: Each box guarantees a shiny, foil-stamped autographed card
Note: The Premium Booster Box is a special release with a different configuration of cards and a higher chance of pulling a signature card. 
What to find inside
Character, event, and climax cards from The Quintessential Quintuplets series
Cards feature Japanese text, including character names and abilities
Special versions may include promo cards or other exclusive content
A variety of rarities, such as common, rare, double rare, and special rare cards