Kaya Yusha is an ordinary student who struggles to perceive life in a positive light. Living near the heart of Tokyo, all seems normal until one day a mysterious link and a plea for help is sent to her in an E-mail. Gathering her friends to show them the odd message, they click the link in the hope to learn more but soon find themselves suddenly stuck in a fantasy world full of monsters, elves, magic, and war. As they adjust to the drastic changes and their new lives, they search for a way back to the real world and for the one responsible for sending the E-mail.How was it possible in a world without technology?