模も範はん囚しゅう

noun

model prisoner; trusty

Refers to a prisoner who follows rules and is considered well-behaved, often given special responsibilities.

• 彼かれは模も範はん囚しゅうとして、刑けい務む所しょ内ないの図と書しょ係がかりを任まかされている。

  As a model prisoner, he is entrusted with the prison library duties.