Sgt. Frog Season 4 Episode 181 Mushishi: Where the Bugs Are, Sir! / Momoka: The Three-Legged Race Competition, Sir!

A former Keronian assassin and insect fan shows up to tell the Keroro platoon that Pekoponian emotions can be controlled through the placement of bugs. Keroro insists they use Natsumi as the first test subject! Later, Momoka's larger-than-life parents duel over which of them gets to participate in the parent-child three-legged race.