The episode ends with a mystery surrounding Isaki's decision not to wear a yukata at the summer festival initially. She ultimately decides to wear one, leaving an unforgettable impression on Ganta when he sees her. Anamizu and Tao handle the distribution of flyers for the ballroom, with Tao acting as Ganta's supportive wingman, reminding him that the fireworks and Isaki are his main focus that evening.

A pivotal turning point in the plot occurs when Isaki, who now trusts Ganta more, reveals her secrets. She discloses that her skill in navigating dark hallways stems from her childhood spent in the hospital. Although Ganta acknowledges this revelation, he chooses not to probe further. Their intimate moment is briefly interrupted by the arrival of the others, who come to watch the fireworks, after which most of them leave, leaving only the key individuals behind.

The story then takes the characters to the observatory, where the roof opens for the first time, bathing the room in moonlight. Isaki's bold statement, "I would never die from something like that," hints at her vulnerability and inner struggle, revealing the severity of her insomnia, which stems from her past health condition.

The narrative takes an emotional leap when Ganta, moved by Isaki's confession, promises to stay awake with her whenever her fears become overwhelming.

The episode ends with a touching gesture from Ganta, who sets up a radio station just for Isaki, providing her with a safe space to share her thoughts and fears.