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.
By the way,
،بالمناسبة
Sag mal, wir haben gehört, dass die Nummer 2
der Mujina-Bande geschnappt wurde.
Por cierto, oí que atraparon
al número dos de la banda Mujina.
Por cierto, he oído que han pillado
al número dos de la banda Mujina.
A proposito, ho sentito che è stato preso 
il numero 2 della Banda Mujina.
Aliás,
Кстати!