Hozuki Castle is a prison run by the Hidden Grass, well known for being notoriously difficult to escape from. Boruto and Mitsuki are sent there to protect Kokuri, a former member of a brutal band of robbers known as the Mujina Gang who's now targeted by assassins after betraying and deserting the gang.
He caused trouble,
so he's in solitary.
لقد تسبّب في المشاكل، لذا فهو في السجن الانفرادي
Der Kerl hat ’nen Aufstand angezettelt
und ist nun in Isolationshaft.
Causó revuelo y lo enviaron
a confinamiento solitario.
Montó una gorda
y lo mandaron a aislamiento.
Ah, se t'interessa lui, 
è in isolamento perché ha fatto casino.
Ele causou problemas, está na solitária.
Он проблемный, посадили в одиночную.