"Heart and Reason," the sixth episode of the first season of Jigokuraku, continues to build on the unique blend of dark, intense action and distinctive storytelling that has made the series one of the standout shows of the season.

The episode primarily revolves around the wild Rokurouta. The hulking warrior, reduced to a primal, uncontrollable state, dominates the screen with his terrifying presence. Rokurouta's transformation into a monstrous figure that attacks furiously without reason or restraint is effectively disturbing.

Caught in the onslaught of Rokurouta's rampage, Gabimaru finds himself in a dire situation. Despite his extraordinary abilities, Gabimaru alone is unable to subdue the monstrous warrior. This forces Sagiri to overcome her inner reservations and join the fight. Even with their combined strength, the duo struggles against Rokurouta's overwhelming power.

In the end, Gabimaru cleverly uses the environment to his advantage. He ignites a fire that attracts local monsters and fills the area with smoke, incapacitating Rokurouta. However, this victory carries a tinge of tragedy. The sight of Rokurouta, once such a mighty warrior, in such a pitiful state, starkly reminds them of the harsh reality of their predicament.

The episode also introduces a new layer of intrigue with the discovery of a seemingly human settlement. This development raises questions about the true nature of Shinsenkyou. Meanwhile, the Aza brothers encounter two mysterious women in the forest.