Episode 7 of "Bullbuster" begins with a heated argument between Tetsuro Okino and the intern Shuichi Namari over Namari's refusal to work overtime and adhere to company rules. The confrontation highlights the differing perspectives within the team, with Okino accusing Namari of lacking empathy and displaying problematic behavior.

Amidst these tensions, Okino bursts into a meeting with the news of having found an underwater excavator that could be crucial for the company's work. Despite the price tag of three million yen, Okino argues that the excavator is necessary for researching the origins of the giant creatures. However, the company's financial constraints make the purchase a challenge.

The episode takes a dramatic turn when Arumi Nikaido learns that her mutated dog Shiro appears to be breathing again—a phenomenon never before observed in giant beasts. This discovery leads to a tense situation at Shiota Bio, where the creature roams the halls.

A plan is hatched to capture the beast alive, and Okino and the others prepare for a confrontation. However, Namari's refusal to participate due to his lunch break further strains the team dynamics. Nevertheless, the team proceeds with the plan, improvising without Namari's help.

The situation escalates as the giant beast heads toward a river, triggering a wild chase. The team's efforts are hampered by a lack of equipment and the challenging environment. In a critical moment, Arumi confronts the beast and is struck down at 18:40.

Following these events, the episode shifts to a discussion about acquiring a water robot through crowdfunding—a proposal that addresses both the financial and operational challenges faced by the team. Namari reveals that he conducted a survey among the islanders to raise awareness about the giant beast issue, finding clear support for transparency.

The episode ends with Namari expressing a desire to learn more about Bullbuster's operations, hinting at a possible shift in his attitude and role within the team.