Under Ninja (アンダーニンジャ)

Storyline

After World War II, the Allied Command in Japan developed an agency to help manage terrorism and violence within the Pacific region. This agency became secretly staffed with Japanese ninja, who were initially tasked to handle domestic affairs. Eventually that program grew to its current form, managing 20,000 ninja across a range of domestic and international affairs. One of those ninja happens to be Kudo, a seventeen-year-old high school loser. A twist of destiny turns Kudo into the next line of defense against a potential surge in foreign assassins invading Tokyo.