As the topic says, No Yaoi please, other than that any genre at all that involves the main character somehow being in prison/jail.

The only ones I've read where the main character was in jail was Riki-Oh and the Stone Ocean part of Jojo's Bizarre Adventure. They don't stay in there long, though...

Quote from Klapzi

The cool part is that I never get tired of being deceived

Quote from tactics

Just because someone's head was chopped off doesn't mean they're dead. That's just silly.

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Shikeisyu 042, the main character is not in prison, but he is closely monitored.

Alive!, death row prisoner becomes guinea pig.

Shamo only in the beginning of the series (oh, almost forgot, there is the mandatory prison rape scene in this one.)

Rainbow, not sure how long they stay in prison, though.

hmm.... there out to be more.

Deadman Wonderland is a very shonen-y manga set in a prison.

yeah i secound Deadman Wonderland because thats the only one i know and it's around the jail theme only slightly messed up 🤣

pieces of eternity are falling through the cracks of sweat, pain and guilt

All are decent, but sadly, all I've read :<

I know there's some godlike manga hidden out there, translated but highly underrated ...I just haven't found it yet! Aaaargghh!!!

Time to go searching again.

Belmondo le VisiteuR
Bradherley's Coach - (I love this one.)
Pandora Hearts

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Doing Time
Its a very heavy read, so it mightn't be to your tastes. It concerns the author's actual time spent in prison, after he was caught in the illegal posession of firearms.
Its quite a mundane read, more autobiographical than plot-driven.
Disappearance Diary is similar to that as well, though the closest thing you get to prison is a hospital rehab center...

um~ 20th century boys, although it doesn't have a prison break until way in the middle of the series. 😕

Apocalypse no toride .
Its about a highschool boy whos wrongly accused of a crime he didnt commit and is sent to a juvenile detention facility , when hell breaks loose and a zombie apocalypse breaks out

Sasori

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Watashitachi no Shiawase na Jikan

Area D - Inou Ryouiki

prison school does a pretty unique take on it. And I second Rainbow