In order to save her mother, Evelyn, an 18-year-old girl, must disguise herself to hide her gender and be able to participate in the largest knights tournament in the world, which will decide Princess Saraya's fiancé. Marrying her would allow her to have enough money to buy the medicine she needs to save her mother. But she is not strong enough to win, so accompanies Evelyn and Moon Mask, a mysterious thief, through an open world full of interesting locations, a variety of enemies and bosses, and mysteries and surprises. Will you focus solely on winning the tournament or will you spend some time getting to know your partner better and befriending her or even maintaining a relationship with her? And with other girls throughout the world?