The cute and cuddly pet of 10-year-old Laura, Hamtaro is a small hamster with a big sense of adventure! Join Hamtaro and the adorable rodent rascals who captured the hearts of millions of children the world over.
Kana’s cousin, Dylan lives on a farm called the Flower Ranch with his parents and pet hamster, Pepper. One day Kana and Laura and their families visit them and bring Hamtaro and Oxnard along. On the way, Oxnard tells Hamtaro about the huge crush he has on Pepper and hearing this, his good friend Hamtaro encourages him to tell her about his feelings that day.
When Mr. Haruna plans to go on a business trip to their old town, Laura wants to go along, hoping to hook-up with her old friend Melanie. After Laura fails to reach Melanie by phone, she decides to send a letter. But Laura never gets a reply so a curious Hamtaro takes it up at the Clubhouse and says he wants to investigate. Just then Jingle appears and Boss and the seasoned globetrotter agree to solve the mystery.
Hamtaro wants to learn to fly after Jingle relays the “Tale of the Flying Hamster.” Then they find a scroll about this special hamster in Panda’s house and his determination increases. In the meantime, Laura is trying to decide on a flower design for a school project and goes to the park, allowing Hamtaro time to persuade his Ham-Ham pals to join his new adventure.
Hamtaro, hearing Laura and Kana talking about going on a picnic, thinks that it would be a great idea for the ham-hams as well. He takes the idea to the ham-ham gang. Everyone thinks it's great, except for Penelope and Bijou, who don't know what a picnic is and wonder what involves.
Laura visits the local museum to gain some information for an independent study assignment. As she talks with her family about it, they talk about something at the museum that they think looks like a giant sunflower seed. Hamtaro, listening in, focuses on ""giant sunflower seed."" He takes the news to the ham-ham gang, who wonder about the origin of this giant sunflower seed. They think maybe that aliens brought it to the planet Earth. One thing they do know: they have to get the museum to check this out.
Kana's country cousin, Dylan is coming for a visit and he's bringing his hamster, Penelope, with him. Oxnard is still madly in love with Pepper and can't wait for her to come. Meanwhile, all of the ham-hams are planning a surprise party to welcome Pepper.
