She was abandoned in a brothel and picked up by Yakuza's adoptive father, who raised her as his son. After the death of her adoptive father, she gradually became a female ruffian. He is the adopted son of a certain village, and he (she) got to know him (her) while traveling abroad. By chance, the two join hands to search for the "treasure map". Can they find the treasure that has been rumored all over the world?