The story of Traysia follows Roy, a young man living in Johanna who dreams of exploring faraway lands. His chance finally arrives when his uncle, a travelling merchant, sets out on a journey and invites Roy to join him. As Roy embarks on his adventure, he is given a pendant by his girlfriend Traysia, which serves as a reminder of her.
The gameplay in Traysia is a party-based RPG with randomly encountered enemies. Combat is similar to early Ultima games, where the player's party is positioned at the bottom of the screen and enemies are at the top. Characters can attack if they are close enough to an enemy, or move towards them to reach their turn. Magic spells must be cast in the right direction to harm the enemy.