On his fifteenth birthday, Higurashi suddenly broke into the time tunnel and returned to Japan's Warring States Period five hundred years ago, where he met the half-demon "Inuyasha" who was sealed in the sacred tree. But Ali, who didn't know anything, not only lifted Inuyasha's seal, but also broke the Four Souls Jade. In order to snatch back the fragments of the Four Souls Jade from many monsters, Inuyasha and his party began their journey.At this time, bursts of strange demonic power emitted from the forest known as the "Forest of No Return". "Agatemaru", the son of the leader of the monster army who was repulsed by InuYasha's father and sealed in this forest, resurrected carrying the resentment of his clan and launched an attack on InuYasha and his party!