Episode 13 of Gantz , titled (or "Open Your Eyes" in some translations), marks the high-stakes finale of the "Tanaka Alien" mission and serves as the season finale for the first 13-episode run. Plot Summary: The Tanaka Boss Fight
After Hojo and Kishimoto eliminate the remaining smaller Tanaka aliens, the "Suzuki" boss emerges from the rubble. It is far more lethal than its subordinates, immediately killing the survivor Haruya by tearing his head off.
Facing certain death, Kei Kurono undergoes a rare moment of clarity and resolve. He declares he is "tired of running away" and decides to stand his ground.
The boss grabs Kei and flies high into the air. In a desperate move, Kei manages to shoot the creature's head off while falling, securing a narrow victory.
Like much of the 2004 anime, this episode is often criticized by fans for its slow pacing . Reviewers frequently note that simple actions, like characters screaming for help or staring at the enemy, feel excessively drawn out compared to the fast-paced manga.