S12·E24 Ouja's Secret

Reiko tracks down and investigates Takeshi in order to find out the truth behind his aggressive, vexed behavior, only to discover that Takeshi had a long-lost brother who still lives. Following Miyuki's death, Shinji blames himself for letting Miyuki die in Takeshi's hands. Disgusted by her brother's reckless action, Yui decides to revisit the old mansion, urging Shiro to stop the Rider War. While Ren, Shinji and Shuichi battle against Mirror Monsters, they discover that the Contract Monsters they owned suddenly disappeared, when Shiro appears telling them that the Rider War is over.