Laura and Kana visit the Aquarium with their fathers, and the Ham-Hams follow along. Inside the Aquarium, strange sea creatures overwhelm the hamsters, but Hamtaro recognizes it as the place from the fairy tale that Laura read the night before.

There is a Sports Festival at Laura and Kana’s school, and the girls are participating in the Parent-Child Triathlon with their fathers. The Ham-Ham’s decide that they want to organize a competition of their own, so they attend the festival to see what’s involved.

Mr. Yoshi, Laura’s teacher, cannot forget Charlotte, the beautiful woman he met in the wild classroom chicken incident, so the Ham-Ham girls (who are natural romantics) set out to find her.

During the rainy season, the Ham-Ham’s want a change of atmosphere so they decide to redecorate the Clubhouse. After they finish, they try to go outside, but find that the door won’t budge, because a mole dug a hole while they were decorating. The mole-hole has brought mud & water into their tunnel, and it threatens to seep into the Clubhouse!