Mai is a kunoichi who inherits the Hidaka style ninjutsu. - He voluntarily declined the competition for succession and began teaching martial arts to the villagers at the Ninjutsu Village. - One day, the dance master Jinsai goes missing. - Mai goes down to the village at the foot of the mountain in order to get clues from her siblings, Gorai and Horai, who lost the battle for successors and became ninjas, but the village is ruled by Horai and the others, and the villagers learn the dark secrets of Hitaka-ryu ninjutsu. - It was used as a tool for human experiments to develop. - In order to deprive Mai of her qualifications as a successor, Horai and the others use Hitaka style lewd techniques and trap Mai into a trap of shame! - [BAD END]