Yuusei is gonna be having a really bad time on the first day, a combination of being generally disgruntled about their circumstances (prison AGAIN) and realising that night that his sclera turned black upon being rezzed, a trait commonly associated with Dark Signers. He'll also be kind of confused by the fact that his body fluids are now semi-molten and very flammable thanks to death by fire, mostly because he knows something is different (things are glowing inside of him) but he doesn't know what or why.

After that though he'll mostly be giving his best to distract himself from these new changes and to earn favour with his captors, a practice he wouldn't normally even consider if it weren't for the fact that this place is abundant with incredible technology - half the reason why he even signed on to the carnival in the first place. Ultimately his goal will be to escape, but he might be more or less hesitant to as time goes on; that'll likely depend the most on how these "trials" play out.