The entirety of episode 4 centers around determination and resolve. Mainly concerning Hiro and Zero Two, but also in small part with Ichigo and the rest of her team.
Episode 3 subtly dives into more details while keeping its steady pace of universe building and character development. Things get a little faster with the introduction of their very first actual mission. Of which, realities and gravity of all the characters’ situations are tasted.
After an explosive first episode that left a lot of questions about the story universe untouched, we enter episode 2.