Prince Yamato is a crown prince of the emperor throne of Japan and a faithful adherent of the god of thunder Susanoo-no-Mikoto. He examines his future possessions. In Izumo province he founds out that the horrible eight headed dragon tortures the neighborhood. This terrible demon has already eaten seven of eight lord Achi's daughters, now he is about to eat the last girl. Nobody can stop this monster as regular weapon does not help... Luckily, prince Yamato owns a legendary artifact - a magic sword of Kusanagi-no-Tsurugi. The honor of samurai did not let Yamato stay aside the trouble - he decided to help Izumo inhabitants. He will experience many adventures and dangers on his way to the dragon's den. He will need to use not only his sword but also his brains.