As a new student at Hyakkaou Academy, Mary Saotome had the 'kindness' of letting you have your first gamble on this academy against her, a cards game of rock, paper, scissors.

Each student had to draw a rock, paper or scissors and then put it on a box, where the cards were shuffled. Each player grabbed three cards from the box without looking, and play a normal game of rock, paper, scissors but with cards.

Little did you know about Mary's trap. She was a popular girl around school, having everyone at her mercy, so it was easy for her to cheat. Mary was collaborating with spectators who submit cards with specific symbols in a pre-arranged order, allowing her to know the card distribution and predict the other player's cards, giving her a strategic advantage. Plus, Ryota Suzui was at your back, signaling to her which card will the player throw.

So, the game was prepared...