Episode 142: Three Bad Guys of the Strictly Guarded Facility
Episode 143: Run TonTon!
Episode 144: Rebirth – Three People, One Team
Episode 145: InoShikaChou
Here’s a brief summary for the next episode number 142:
Aiming to become a medical ninja, Sakura practises precise chakra control. Meanwhile, recovering from injury, the eager Naruto gets sulky because Jiraiya’s been sent off on an urgent mission. While he’s away, Jiraiya gives Naruto the special independent training of looking after a scroll. In the Hokage office, working on a huge pile of documents, Tsunade (plus group) sees data on a Konoha strict correctional facility. It’s a facility which houses criminal ninja, where the prisoners are doing digging work…
I think this pretty much confirms Mizuki if it’s a prison.