Himawari!

Himawari Hinata transfered to Shinobi Gakuen to train to become the best ninja. She wanted to be a ninja ever since she was saved by one when she was little. On her first day, she meets a new transfer teacher named Hayato Madenokoji who saves her life. Even though Hayato does not possess ninja skills, he is teaching the ninjas about normal society to pay off his debt. But, Himawari notice that Hayato has the same mark as the ninja who save her life before. It has 2 type series, the first series created in 2006 and has 13 episodes, the second series created in 2007 and has 13 episodes. The series are comedy and romance, it's recommended for teens to watch.