Millennium Booster Set 1: A Story of Betrayal is the first Booster Set for the Millennium series.
- Contains ?? cards (1 BR/?? RRR/?? RR/?? R/?? UC/?? C) + ?? SP
- Introduces Divine World, Legion World, and 2 other Unknown Worlds
- Each booster contains 5 random cards, one of them definitely R or greater, and also there may be the foil version of any R/UC/C card.
- Each display includes 1 of 4 flag cards from Divine World, Legion World, and 2 other Unknown Worlds.