In this episode of Kimi wa Houkago Insomnia, the plot revolves around Ganta and Isaki as they prepare for their training camp. The episode begins with the two characters making preparations, for which they need to obtain permission from their parents. They are accompanied by Kurashiki-sensei, a supportive figure who had previously helped Mr. Shiromaru at a photo contest.

Over the course of the episode, it is revealed that Isaki's parents have asked Haya-san, Isaki's sister, to act as a chaperone for the training camp. This development introduces a new facet to the story as the characters visit the Nakami household. Here, insights into the relationship between Ganta and his father, Kokuchi Hidenobu, are provided. It becomes clear that their relationship is marked by a lack of communication; Ganta is seen preparing meals while his father appears distant, mostly sleeping on the couch. Their brief interaction reveals that Ganta's mother has left them, which has impacted Ganta's ability to communicate and sleep.

After leaving the Nakami household, Ganta, Isaki, and Haya travel to Kanazawa for shopping and photography. The episode showcases the dynamic between Isaki and Haya, which is portrayed as a mix of closeness and playful hostility.

Later, the trio heads to their grandmother's house by the sea to conduct their training camp. The house is described as a beautiful location near a magnificent shrine. Upon arrival, Ganta dedicates himself to photography while Haya pulls Isaki aside for a private conversation. Through playful banter, Haya seems to assess Ganta's sincerity toward Isaki and his general reliability. She ultimately concludes that Ganta is trustworthy and harbors no ulterior motives toward Isaki.

Haya decides to leave Isaki under Ganta's supervision and goes to meet her boyfriend. Thus, Ganta and Isaki are left alone in the spacious house next to a bus stop, where numerous possibilities await them.