Episode 4

Episode 4 ("Big Sister, do I have to go to Space?") is the fourth episode of the Null & Peta anime series.

Summary
To convince Null to go to school, Peta sets the mood by reenacting a school entrance scene with falling cherry petals. When Null is still reluctant to go, the jet booster in her backpack activates, flying her off to school anyway.

Null then reveals that she made some modifications to that backpack, allowing her to freely control its flight and take a sightseeing tour through the city. But when Peta presses a wild combination of buttons on an arcade machine, intentionally or unknowingly, Null loses control once again, and the rocket booster flies her off to space.

Null briefly enjoys the silence and (even for her standards) lonely environment but is quickly caught off guard by Peta bringing her gym shorts. When Peta notices that Null is hungry, she panics and blames herself for not making enough fried rice lunch.

Promptly rushing back to Earth to bring back some food, Peta brings back chocolate and Miso Ramen, which Null obviously can't eat because of her astronaut suit. Peta's battery then runs out, making the now stranded Null wonder if she should have just gone to school.

Trivia

 * The bloomers are labeled with "3-1 ぬる", which indicates that Null is a 3rd-year grade-schooler, making her approximately 8 years old.