is a Japanese anime series created by GoDo, directed by Shigenori Kageyama, and produced by Genco.
The people of Kasumi Kogen are alumni of the school, and they run and jump and disappear as if the whole town were a big ninja house.
She has transferred to Shinobi Gakuen to train under Ichikawa Raiso and fulfill a dream of becoming a kunoichi that she has fostered since she was saved by one in her childhood.
On her first day, she meets Hayato Marikoji, a teacher who is himself just arriving at Shinobi Gakuen, and he saves her life.
However, Himawari notices that Hayato bears the same mark on his neck as the ninja who saved her when she was young.