NARUTO: Fuu no Sho - Sugao no Shinjitsu...!!

Team 7 finishes yet another unremarkable mission. After Kakashi leaves them for the day, Naruto suggests an S-rank assignment: finding out what Kakashi looks like under his mask. Sakura is uninterested until Sasuke states he wants to help. They are abruptly approached by a man named Sukea, a travelling photojournalist and former Anbu who offers to help them break into the Third Hokage's archives to check Kakashi's personnel record.

(Source: Naruto Wiki)

A ninja was a covert agent or mercenary of feudal Japan specializing in unorthodox arts of war.

The functions of the ninja included espionage, sabotage, infiltration, and assassination, as well as open combat in certain situations.
The ninja, using covert methods of waging war, were contrasted with the samurai, who had strict rules about honor and combat.

Ninja

Action anime usually involve a fairly straightforward story of good guys versus bad guys, where most disputes are resolved by using physical force. It often contains a lot of shooting, explosions and fighting.

Action

Shounen

The antics of the protagonists do not take place in some exotic setting or time, but in everyday life. When not "at the job" this means getting up in the morning, making meals, house cleaning, going shopping or out to eat, visiting the bath house or spa, leisure activities in the spare time, etc. The time "on the job" for students is School Life, for others working in their profession. Daily Life is basically a synonym for everything normal, repetitive, and trivial happening to your average person.

Slice of Life

Anime whose central struggle causes hilarious results. These stories are built upon funny characters, situations and events. A comedy anime is laced with humour and sets out to provoke laughter from the audience.

Japanese humour can be a bit strange to westerners, so if you're new to this type of humour, just bear with it; it'll most likely grow on you if you're a fan of other kinds of comedy.