Itsuki Watanabe

In this fantasy manga, a washed-up magician with a strange disease loses his adventurer's license but starts a new adventure when he finds a cursed girl in the middle of the forest. Douglas, once known as a legendary enhancement spellcaster, is now little more than your average, weak old man. On top of that, he was kicked out of the hero party, and eventually had his adventurer's license revoked...
And that's how he ended up a vagabond, wandering aimlessly. After an encounter with Rabi, a cursed little girl, a new adventure begins...