Lacile, a human weapon made during the last great war who now lives in isolation, meets Leana a runaway princess from the floating city of Ariadne and becomes her knight of the blue sky. They set off into the outside world, both harboring the dream of seeing what the world has to offer!
Ariadne in the Blue Sky is a completed manga by Yagi Norihiro, first published in 2017. It blends sci-fi, action, comedy and adventure. You can read all 3 available chapters of Ariadne in the Blue Sky online for free on MangaPulse; the newest is Chapter 84, added 2025-05-13. The series is finished, so you can read it from start to end in one go.