Highschool student Recca Hanabishi aspires to be a ninja and is obsessed with anything ninja-related.
After meeting a girl named Yanagi, whom he acknowledged to be his princess, he finds that he not only comes from a long-dead ninja clan of 400-years past, he can also control his personal Flame.
Recca and his friends must protect Yanagi from being taken by Kurei and his adopted father, the evil Kouran Mori, who wants eternal life, and believes that Yanagi's mysterious healing power is the key to it.
