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.
If you try to escape
outside the castle,
Wenn ihr versucht von hier zu fliehen,
werden diese Fesseln zur Flamme
Y si intentan escapar,
Y si intentáis escapar,
Se doveste cercare di fuggire, 
la mia tecnica muterà in una catena di fiamme
Se tentarem fugir daqui,