....I wasn't expecting much, but I was pleasantly surprised, in a good way since I managed to read the whole thing in one sitting, couldn't put it down. As the synopsis of the manga describes, the first volume spends a good chunk of it going through Yuuto's background [his family and life prior], some details about the crime he's been framed for and [especially] his trek through Schelger Prison while investigating for the FBI agent for a terrorist leader known as Corvus inside the prison in order to ultimately get out faster. Since the major focus of the story is the manhunt for Corvus, the prison environment, major players, factions and leaders are fleshed out. Some of the background stories though seem like something out of prison shows like "Prison Break" and a bit cliche at some point, but it works.
As romance goes, there's a few pairings that are teased. You have the cover couple Yuuto and Dick. In volume one, very little develops in regards to that. Yuuto at some point does become self-conscious around Dick later on in the manga and you do find out that Dick has some interest in Yuuto. It's just Dick doesn't want to force himself on him, or implies it at least, more of the I want love in sex sort of character? Outside of the main couple you have probable pairs like Dick x Nathan, Mathew x Dick, Tonia x Yuuto and then you have all the other prisoners and their substitute partners. There's no sex at all or anything explicit in the first volume.
The manga is very story and character driven which is a nice change, since I've read way too many bl/yaoi manga where it's often boy meets boy, boys have sex, boys fall in love, the end or they fall in love too quickly. For those looking for story and character development, I recommend picking it up.