Ep 4. Black Bullet

In the fourth episode of Black Bullet season 1, titled 'Black Bullet,' we see Rentaro and Enju continue their mission to protect the citizens of Tokyo from the monstrous Gastrea virus. The episode focuses on a new threat - a powerful Gastrea that has infiltrated the Tokyo Area's Security office and taken control of their central computer system.

Rentaro and Enju are dispatched to deal with this new threat, accompanied by Kisara, the head of the Tendō Civil Security agency. They arrive at the security office, only to find that the Gastrea controlling the computer system has set a trap for them. They are forced to fight their way through a horde of mechanical drones, risking their lives to reach the Gastrea at the heart of the system.

Meanwhile, we learn more about the history of the Gastrea virus and its impact on society. It is revealed that the virus was originally created as a biological weapon, with devastating consequences. While humanity eventually managed to develop a vaccine that prevented humans from becoming Gastrea themselves, the virus remained a constant threat. Some humans, however, were able to develop superhuman abilities as a result of exposure to the virus - these individuals, known as Cursed Children, are now fighting alongside Rentaro and Enju against the Gastrea.

As Rentaro, Enju, and Kisara battle their way through the security office, we see the characters develop and grow. Rentaro, who has always been determined to protect the innocent, becomes more willing to take risks and put himself in danger as he realizes the magnitude of the threat they are facing. Enju, who is still struggling to control her Gastrea powers, begins to show a greater level of control and focus in battle. Kisara, who has always been a capable fighter, reveals a more vulnerable side as she is forced to confront the reality of the threat facing the city.

The episode is filled with intense action sequences, as Rentaro and his team battle their way through waves of enemies to reach the source of the threat. The animation is stunning, with detailed character designs and dynamic fight scenes that keep the viewer on the edge of their seat. The music also adds to the tension, with a gripping soundtrack that heightens the stakes of the battle.

Overall, 'Black Bullet' is an exciting episode that highlights the best aspects of the series. It showcases the great character development, intense action, and gripping world-building that have made Black Bullet such a beloved anime. Fans of the series will not be disappointed by this thrilling episode.