If you're looking for manga similar to Doing Time, you might like these titles. All recommendations are made by Anime-Planet users like you!
In the mid 20th century, young Hiroshi found himself enamored with manga – especially works created by Osamu Tezuka. With a strong desire to publish his own works, Hiroshi picked up a pen and began a lifelong journey to live up to his role model. Through disappointments and triumphs, Hiroshi continued on to help birth a new form of manga, as the history of the medium unfolded around him…
Another autobiographical work with a similar emotionally detached, matter-of-fact manner of storytelling. The intent of both seems more to educate than entertain, and in reading both you'll certainly learn oodles about Japanese society (the penal system in Doing Time, and manga making/the history of gekiga in A Drifting Life).