What becomes of morality in a world shrouded by the zombie apocalypse? The inmates of a juvenile prison find out the hard way. Cast from their protection and forced to put their lives on the line for the very guards they hate, these teenage criminals are cast into harm's way with no regard for their wellbeing. Will they all die eventually, or will they find freedom and maybe love?

Sawada Tsunayoshi is ordinary. Average. Not at all special in any way. So while having ties to the mafia comes as a surprise to Tsuna, the fact that his younger, more talented, more popular twin brother is chosen as the next Vongola boss doesn't. Not everyone agrees though. After all, what is a world without a proper sky?