In Episode 15, the story focuses on Fable and Kuro, who embark on a survival trip in the mountains together. Fable helps the exhausted Kuro by crafting a walking stick for him and teaching him essential survival skills. They encounter various challenges, including a wild boar and a snake, which Fable handles with bravery.

The duo sets up a temporary camp and emphasizes the importance of adapting to nature and forgoing urban comforts. Fable uses these moments to teach Kuro resilience and to show that the lessons learned in nature can be useful in urban life, but not the other way around.

Despite initial reluctance, Kuro participates in the survival activities and learns to prepare meals from unconventional sources like snakes and frogs. Their relationship deepens through shared tasks and Fable's encouragement. Kuro grows to admire Fable as he navigates the harsh environment.

As night falls, Fable remains vigilant, keeping watch for potential threats to ensure their safety. Their conversation reveals that Fable uses these excursions to maintain his skills as a contract killer and to reinforce his determination.

The episode ends with a scene shift to Yoko, who is looking forward to meeting Mr. Kawai.