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.
It's a summer festival! The Ham-Hams learn from Maxwell that on the night of the festival, flowers (fireworks) will appear in the sky. Pashmina separates from the Ham-Hams to find the flowers.
Hamtaro goes with Laura and her family to visit her grandmother in the country. The Ham-Hams are excited for Hamtaro, because Grandmother's house is surrounded by sunflower fields.
After Laura begins a new semester, the Ham-Ham pals start to wonder if they might be missing something by not going to school. After Hamtaro, Oxnard, and Boss sneak into Laura's school for a day to check things out, the Ham-Hams set up a separate school of their own.
Laura's father asks her to deliver an important floppy disk to his office. While Laura packs her bag, Hamtaro gets trapped inside. On the way to Mr. Haruna's office, Hamtaro picks up two hitchhikers, Oxnard and Penelope, who have just escaped from an angry crow. When Oxnard's sunflower seed falls to the ground, Oxnard jumps out of Laura's bag to go after it, and Hamtaro and baby Penelope follow, not knowing that the yellow disk has slipped out of Laura's bag too.
It's Grandparents Day, and when Grandma comes for a visit she shows Laura an old clock that she and her friend, Kaitlyn, bought years ago. Laura is touched by the story and decides to surprise her grandmother by trying to find her long-lost friend for her.
When Laura and Kana go shopping, the Ham-Hams go along, but soon find danger in the shopping district. Bijou wanders down a nearby alley, but she doesn't return!
