Intro. At the heart of Nanba Prison — the safest, most eccentric, and unpredictable in the world — is a cell that defies all logic: Cell 13, home to four inmates as troubled as they are inseparable. Jyugo, Uno, Rock, and Nico spend their days amidst confusion, laughter, and failed (but creative) attempts to escape.
They live their chaotic routine without major worries... until an unexpected announcement from Hajime, the prison's most temperamental guard, changes the mood in an instant: a new prisoner is on the way.
No one knows who he is, where he came from, or why he was sent to the most troubled wing of them all — but one thing is certain: his arrival promises to turn Cell 13 upside down and set off a new string of disasters, fights, and laughter worthy of Nanba's worst block.
And that's how a new story begins—explosive, colorful, and completely unpredictable.