Manga by author Takuma Tomomasa - Status ongoing

The spaceship which Imperial Galactic Navy Officer Alan Corinth helmed was shot down by a surprise attack during hyper-space navigation. Completely due to freak coincidence, Alan became the only one in the ship to survive. The severely damaged spaceship lost its navigation capabilities and plummeted onto a nearby planet. Using an escape pod, Alan headed toward the planet alone. Thus began Alan's quest for survival on the underdeveloped planet utilizing the symbiotic nanomachines [Nanom] within his body. Surprisingly, the planet was home to a thriving human civilization whose genetic code closely resembled Alan's own. Even while remaining at a loss due to being thrown into a world of swords and magic, he tries to live as best he could together with his newfound comrades. What would Alan achieve this strange world? The Sci-fi Fantasy story in a Medieval setting now begins!

The story takes place in the same official Code Geass history as the anime, but in a different era. The title character, Renya, is a 17-year-old boy with a mechanical left arm and shuriken throwing stars as his weapons of choice. The story begins when Renya encounters a mysterious, perpetually young witch named "Reifuu C.C." C.C. has appeared in Japan's historical Edo era to seek a new partner for a covenant. Meanwhile, a mysterious man, with a striking resemblance to the character Lelouch of the original anime, also appears with unknown intentions.