Illya and the gang have finished their battle against the heroic spirit residing in the eighth class card. They’re back in vacation mode again, looking to make the most of what they have left of summer break. But their hopes get crushed in the blink of an eye.An all-too-unrealistic silhouette appears before them when they go to investigate the strange event at Mount Enzou. After a short skirmish, the entire space ends up being warped. Illya wakes up in a wintry Fuyuki City… in a parallel world.
3rei！劇情將接於2wei Herz！之後，當伊莉雅一行人尋找到神秘第8張職階卡後，卻在名為「吉爾」的少年引導下發現了美遊深藏於心中的身世之謎，並當場引爆一場毀天滅地的聖杯戰爭。雖然最終在伊莉雅努力之下，成功將美遊從既定的命運中拯救出來，但卻沒人發現另一場陰謀正蠢蠢欲動……