In "Venus," the fourth episode of Kimi wa Houkago Insomnia, the relationship between Ganta and Isaki grows as they explore their feelings for each other. The story takes place in the charming town of Nanao and features real-life locations that lend authenticity to the setting.

Throughout the episode, Ganta and Isaki exchange glances that reflect their mutual curiosity about their budding romance. Meanwhile, Isaki's friends discuss love without truly understanding it, remaining fascinated by Nakami.

As Ganta grapples with the challenges of astrophotography, he receives advice from Betty on setting up a tent during a visit. A seaside camping trip is on the horizon, and Ganta plans to bring a camera despite being denied permission. However, the rainy weather throws a wrench in his plans.

The rain provides Ganta and Isaki with an opportunity to grow closer and share their thoughts. Ganta invites Isaki to a fireworks festival, and they agree to meet at midnight on the beach if the weather permits.

Unexpectedly, their classmate Haida Rui spots Ganta during a nighttime photography excursion. The situation escalates when their homeroom teacher eavesdrops on their conversation, leading to a confrontation between Ganta and the teacher, as the latter shows no understanding of their sleep disorders.