In a busy trade city, item engineer Leicester Maycraft’s guild of adventurers—Oasis—gathers to watch a meteor shower. After one of the falling stars crashes into the cathedral, Maycraft discovers a sleeping girl who carries a mysterious message. When she wakes up—his life takes an adventurous turn!
Ert'Aria, a city known as the "Treasury of the World" is preparing for a harvest festival. Leicester Maycraft, a young item technician of the Oasis clan, encounters a shooting star near a party he is attending. Upon finding it, a girl appears before Leicester calling him her father.