Ep. 4: Earth-Saving Hunter
Ipinalabas noong Pebrero 4, 2017
The episode starts with a scene in a war zone. Kotarou and a colleague talked to each other while inside a military vehicle. Enemies attacked them, which escalated to a shooting. Kotarou was especially tense, but chose to fight using his rifle. That was the first time he killed someone. (Source: Rewrite Wiki)