Sango, a skilled demon slayer, is summoned to Hitosumi Castle along with her father and younger brother, Kohaku. But it's a trap—Kohaku, manipulated by the enemy, slaughters his family. Meanwhile, their village is wiped out by a youkai raid, and Naraku seizes the Shikon shards. Barely surviving, Sango is told Inuyasha is behind it all...

Sango reveals the origin of the Shikon Jewel: the priestess Midoriko, in a deadly battle against countless demons, expelled her soul—merged with theirs—to form the jewel. Purified under Kikyo's care, it nevertheless brought tragedy. Inuyasha vows to break the jewel's curse once and for all...