It's what it says on the tin, [Kodansha (Akira Hiramoto)]'s 'Kangoku Gakuen (Prison School)' Manga Vol1 Manga Artstyle for PonyXL.

It should just work out of the box. Not entirely sure how to pull specific characters out of the lora with descriptions or tags but you might have more luck. Doesn't seem like the characters are built into ponyxl from some light experimenting, but the Lora should still be able to capture the general style of the manga in some regards.

Anyways, enjoy and take care.