The premise of the show is pretty basic, but the actual events that take place actually have tons of moving parts. There's so much attention to detail that you'll be very impressed with how elaborate and ingenious it all is when plans unfold.
Although there are 5 protagonists, really only 3 ever get anything more than a side role. The remaining 2 characters do have their occasional moments, but mostly they're just there. Would the show have been better if they'd had more screen time? That's hard to say given how much I already enjoyed it. The antagonists are equally likable but for different reasons. The punishments they dish out are absurd in the best way possible. And their attitudes really sell their roles as spiteful wardens.
How would I describe the show's style of humor? The first word that comes to mind is "ridiculous." The gratuitous fan service is hardly worth mentioning because most of the show's hilarity comes from the situations the writers think up. Things always go awry when the protagonists plan to escape or what have you, and the dread of them being discovered is an experience in and of itself. And the execution of their far-fetched schemes always involve them doing something utterly unbelievable.
So now I'll tell you what not to expect from this anime. Don't expect formulaic episodes or childish humor. Make no mistake, everything is very well thought-out and you'll never be disappointed. This is hands-down the best comedy anime I've seen.
