Arakawa Under the Bridge - Season 2 - Eps 10: 10 Bridge * 2
With an apparent 500kg weight limit for the rocket to Venus, everyone goes on a diet so they can all go together. While Ric and the Mayor lose weight at a spa, the girls suffer through a strawberry only diet while the others have survival training with Sister. As a result of Sister's training, one of the Metal Brothers, Tetsuo, gains powerful muscles, and he soon confronts Stella to see who is more powerful. In order to stop their fighting, his brother Tetsuro builds up his muscles and manages to stop Tetsuo by showing a stronger love for his muscles.
About Arakawa Under the Bridge

Title: Arakawa Under the Bridge
First Air Date: 2010-04-05
Last Air Date: 2010-12-26
Status: Ended
Rating: 6.5/10 (from 34 votes)
Language: JA
Seasons: 2
Total Episodes: 26
Network: TV Tokyo
Genres: Animation, Comedy
Production Companies: SHAFT, AT-X, TV Tokyo, Square Enix, TV Osaka, TV Setouchi Broadcasting (TSC), TV Aichi, King Records
Synopsis
Ko Ichinomiya's family motto is "Never be indebted to anyone," but after losing his pants and falling into the Arakawa River, he quickly finds himself in debt to his savior, the cutely insane Nino who happens to live under the bridge. To repay her, he vows to help her with her desire to "experience love." Along the way he'll meet the river's other residents, including a hot-blooded kappa, a Sister in drag, and a literal rock star.
Cast

Hiroshi Kamiya
Kou Ichinomiya (voice)

Maaya Sakamoto
Nino (voice)

Keiji Fujiwara
Village chief (voice)

Takehito Koyasu
Sister (voice)

Chiaki Omigawa
P-ko (voice)

Miyuki Sawashiro
Maria (voice)

Tomokazu Sugita
Hoshi (voice)

Chiwa Saito
Stella (voice)

Yu Kobayashi
Amazoness (voice)

Cho
Terumasa Takai (voice)