After being captured for attempting to assassinate the leader of Kumogakure, the Raikage, and killing Jounin from Kirigakure and Iwagakure, Naruto is imprisoned in Houzukijou, a criminal containment facility also known as the Blood Prison.
The master of the castle, Mui, uses the ultimate imprisonment jutsu to steal power from the prisoners. In this place, something is aiming for Naruto's life. The battle to prove his innocence and uncover the truth has begun for Naruto and his friends.
(Source: AnimeAvenue)
Characters & Voice Actors

Mui
Main
Terasoma, Masaki
Japanese
Ryuuzetsu
Main
Sonozaki, Mie
Japanese
Uzumaki, Naruto
Main
Takeuchi, Junko
Japanese
A
Supporting
Billingslea, Beau
English
Aburame, Shino
Supporting
Akamaru
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