Nabari no Ou

Nabari no Ou (隠の王, Nabari no Ō, lit. "Ruler of Nabari") is a Japanese manga series written and illustrated by Yuhki Kamatani. The series premiered in Japan in Monthly GFantasy in 2004 and the final chapter was released on August 18, 2010. Square Enix is also publishing the individual chapters in collected volumes with eleven volumes released as of June 2009. The series has been licensed for an English language release in North America by Yen Press. The first volume was released in May 2009.

Nabari no Ou was a finalist in the 2005 Japan Media Arts Festival and was a recommended title.

Plot
Silent, apathetic yet mischievous, 14-year-old Rokujou Miharu is the bearer of the hijutsu, "Shinrabanshou", a powerful technique many ninja clans desire to possess to become the ruler of Nabari. Fellow classmate Kouichi and his English teacher Kumohira are both secretly Banten clan ninjas, pledging themselves to protect Miharu from his many attackers. Keeping apathetic, Miharu attempts to reject their invitation to join their ninja ‘club’ however, after numerous attacks; he finds no choice but to join their group as a means for his survival. Slowly, Miharu takes a step closer to becoming the ruler of Nabari.

Other Sources

 * Nabari no Ou