曇天に笑う＜外伝＞ ～桜華、天望の架橋～

A man covered in snake scales, with a face that recalls Tenka Kumou's, attacks Soramaru and demands to know where Tenka is. Soramaru learns the attacker is the product of experiments using the Orochi's cells, research that should have ended once the serpent was destroyed. As he and the Yamainu dig into who is keeping it alive, the trail leads to former members of that same military unit, and the Kumou brothers end up fighting side by side against the army. This third and final Laughing Under the Clouds side story film is set after the main series.