Based on the Shukufuku no Campanella - la campanella della benedizione - adult game by Windmill.

Overview

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!