The manga series Captain Corinth: The Galactic Navy Officer Becomes an Adventurer is based on web novels. This science fiction story takes place many years in the future, and the main character, Alan Corinth, is in deep space. When something goes awry, he ends up alone on a planet where humans are able to breathe oxygen.

Read the full article here:
https://otakuusamagazine.com/captain-corinth-the-galactic-navy-officer-becomes-an-adventurer-is-a-fun-scifi-fantasy/