Trapped in the land of Avalon, a young knight seeks hope in a mysterious ring that promises to grant him new power. Meanwhile, Mana, plagued by fear over her old friend Chihiro's return to Japan after a 10 year absence, receives an intriguing ring with no explanation. When she accidentally activates the ring by splashing water on it, she's transported to a dream-like world full of magic, fairies, and strangely familiar faces. There, she meets Lancelot, a runaway knight from Camelot who has become trapped in Avalon. Despite his fading memories, Lancelot is determined to escape and seeks Mana's help. But can an ordinary girl with a striking resemblance to Guinevere truly possess the power to save him? The connection between her world and Avalon remains a mystery.