Mai is a kunoichi who inherits the Hitaka-ryu ninjutsu. He voluntarily declined the succession contest and taught martial arts to the villagers in the village of ninjutsu. One day, Mai's teacher, Nisai, goes missing. Mai descends to the village at the foot of the hill to get clues from her siblings, Todoroki and Horai, who have become shinobi after losing the battle for the successor, but the village is controlled by Horai and the others, and the villagers are used as tools for human experimentation to develop the dark mysteries of Hitaka-ryu ninjutsu. Horai and the others use the Hitaka-ryu Nymphomaniac to deprive Mai of her inheritance qualifications and fall into a trap of shame! ［BAD END］