Lain Iwakura, an awkward and introverted fourteen-year-old, is one of the many girls from her school to receive a disturbing email from her classmate Chisa Yomoda-the very same Chisa who recently committed suicide. 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. Uncovering a terrible secret, the trio embarks on a dangerous operation that may be Naruto's only chance to break free and prove his innocence. But with the help of two fellow inmates, he realizes that there is more to this legendary detention facility than meets the eye. Despite his powers being immediately suppressed by Mui, the prison's warden who possesses the ability to seal chakra, Naruto recklessly engages in futile escape attempts. To avoid a diplomatic conflict, Tsunade forcibly sends him to Kusagakure's Houzuki Castle-a maximum-security penitentiary dedicated to ninja criminals-until the situation is resolved. As the Kumogakure leader repels the assault, he is shocked to discover that the culprit is Naruto Uzumaki! However, the assassination attempt is not the only crime attributed to the young ninja, who vigorously denies the accusations.

During their discussion of a sensitive investigation A, the Fourth Raikage, and his subordinates are ambushed by a cloaked intruder.

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