Sensei Fuji

Sensei Fuji is a Ninja Master who trains children into becoming warriors but one day, a tragic thing happened that is unremarkably disastrous to speak of made his mask glow pink and his mask turns into metal instead of plastic, he has his own training grounds in the woods and he trains 10 kids, Fimiji. Aisaka, Sakura and Sikaru as twins, Daisuke, Arata, Itachi, Misuko, Miku, and Saki. When Fuji gets angry, he punishes them to the dungeon. the 10 kids live with them in his Temple and he takes care of them meanwhile with their parents, their parents were full that they were on a summer camp but they have no idea that their children are going to be Ninja warriors.