The episode begins with a police operation uncovering a mysterious attack that hints at the involvement of ninjas. The scene shows a gathering of modern ninjas on a rooftop, including Kuro, Hibi, and Hachiya from Kumogakure. They discuss their next mission and the enemy they are dealing with—the Rear Support Maneuvers Division 2 of the Ministry of Health, Labour and Welfare, also known as the Rear-Enders.

At the heart of the episode is Kumogakure Kuro, a young ninja searching for work. He lives in a rundown apartment and shares a refrigerator with his neighbor, Mr. Ono. Kuro is visited by a higher-ranking ninja who warns him against leaving the organization and offers him a new job. The mission is to infiltrate Kodan High School, and Kuro accepts.

To complete the mission, Kuro must create a convincing family background. He asks his neighbor Ono-san for help, who, although slightly drunk, manages to convincingly play his mother during a phone call with the school. Kuro prepares to infiltrate the school, studies the entrance exam requirements, and contemplates the upcoming challenges.

The episode also sheds light on Kuro’s past, revealing that his name, meaning "Nine," was the result of a misunderstanding between his parents at birth. In reality, he is an only child. Kuro also shares a sad story about his school friend "Miracle," who died in a lightning strike.

Toward the end, the episode shifts to a flashback where Kuro successfully takes out a stranger who wants to become a ninja. The episode concludes with a brief history of ninjas in Japan, stating that they still exist today and their numbers are estimated at around 200,000.

The episode sets the stage for Kuro’s new mission and offers a glimpse into the hidden world of modern ninjas.