Perhaps there are tales of the psychological torture that inmates endure. Isolation in a small cell for long periods can drive a person mad. Some might have stories of inmates who lost their sanity, screaming in the middle of the night, haunted by their past actions or the hopelessness of their situation.
I'm not sure of a specific one off - hand, but there could be stories about prison riots. These are extremely violent and chaotic events where inmates take over parts of the prison. Innocent people could get caught in the crossfire, and there would be a lot of bloodshed and destruction.
The characters included the male lead, Hugher, a cold teenager who was ignorant of the ways of the world and hated evil! Male supporting character-Yang Nagano, a disciple of the Thousand Leaves Dojo. His swordsmanship was superb, and he had unknowingly learned the armed color of Haki. Male Supporting Actor-Sakasugi, what kind of demonic fruit did Lieutenant Colonel Michelle eat? Male supporting actor-Polusalino, if you want to live well, you can't miss your lunch break!
"A Thunder Blade Guarding Marin Fando" Author: Persimmons Horn. It's a light novel/derivative Doujinshi novel with transmigration, hot-blooded, comics, and sword cultivation elements. It's finished and can be enjoyed without worry.
[User recommendation: A weirdo in the navy. She's not a light-hearted anime transmigrator. Instead, she's a person who writes dramas in light novels. She has a headache and a big brain. She likes dramas.]
I hope you will like this book.
Another fanfic to check out is 'Marin's Melody for Link'. In this one, Marin's musical talent is at the center. She uses her music to heal Link from a strange affliction. It's a shorter fanfic but very sweet, showing the power of their connection through Marin's music and Link's unwavering trust in her.
Marin does confess to Gojo in the manga. It happens during a crucial moment when their relationship reaches a turning point. The confession is filled with honesty and vulnerability.