Donten ni Warau Gaiden: Ketsubetsu, Yamainu no Chikai

A year after the battle against Orochi, Tenka Kumou is alive but carries wounds that have changed his life. He withdraws from those around him, leaving Soramaru and Chuutarou struggling to understand a brother who always hid his pain behind a smile. Their search for answers leads to a part of Tenka's past he never wanted them to see.

Eleven years earlier, Tenka served beside Sousei Abeno in the Yamainu, a government unit formed to confront the coming threat of Orochi. He was a gifted fighter with comrades he trusted, yet the duties of the unit and his responsibility toward the Kumou family could not remain separate forever. By uncovering the choice that drove Tenka away from the Yamainu, his younger brothers finally begin to understand what he sacrificed to keep them safe.