Set in the bustling trading city of Ert'Aria, Leicester Maycraft, an item engineer affiliated with the adventurer guild 'Oasis,' attends a rooftop party with friends to witness a meteor shower. When a meteor strikes the chapel's steeple, Leicester discovers a hidden chamber housing a slumbering girl who awakens claiming him as her father. This enigmatic girl propels Leicester into an unforeseen journey filled with mystery and intrigue.