Ep. 10: The group diets to meet the rocket's weight limit while Tetsuo and Tetsuro compete in muscle strength.
Aired on December 6, 2010

To ensure everyone can board the rocket to Venus within the 500kg weight limit, the group adopts various weight loss methods. Kou and the Mayor visit a spa, while the girls endure a strawberry-only diet. Meanwhile, the others undergo survival training with Sister. This rigorous training causes Tetsuo, one of the Metal Brothers, to develop powerful muscles, leading him to challenge Stella to a contest of strength. To prevent their conflict, his brother Tetsuro also builds up his muscles. Tetsuro successfully stops the fight by demonstrating a stronger devotion to his muscles than Tetsuo, resolving the dispute through their shared obsession with physical power.
Episodes
- Ep. 6 · Shimazaki Investigates Nino While Nino Receives a Tape From Her Parents
- Ep. 7 · Residents prepare for Venus trip while Kou and Hoshi compete for Nino's attention during checkups.
- Ep. 8 · Amazoness joins Kou's class and uses hypnosis to manipulate him into marriage.
- Ep. 9 · Kou delivers a package from Shiro's wife while P-ko hosts a riverbed tea party
- Ep. 10 · The group diets to meet the rocket's weight limit while Tetsuo and Tetsuro compete in muscle strength.
- Ep. 11 · Arakawa Bon Festival and Amazoness's Secret Plan to Confess Her Feelings to Hoshi
- Ep. 12 · Mayor hosts tournament for riverbank strength with wish prize
- Ep. 13 · Maria defeats Sister with insults and forces Kou and others to serve as sheepdogs.