A kid hamster hears a story about where he comes from and can't let it go. He walks away from the birthday party everyone's throwing just to find out if it's true. The whole thing hangs on whether curiosity matters more than being celebrated, and whether a mother he's never met is worth the search.
Hamtaro gets an unexpected gift on his birthday: a revelation. Laura tells him the truth about his origins, but doubt creeps in. Is she really telling him what he needs to hear? Determined to find answers, Hamtaro convinces his best friends Boss and Oxnard to join him on an urgent quest to locate his mother and discover the real story of where he came from. While the three adventurers trek across town searching for clues, the remaining Ham-Hams back home are busy with their own mission: preparing an elaborate surprise party. They're decorating, gathering treats, and counting down the hours until Hamtaro returns. The race is on between two parallel journeys. One hamster is chasing the truth about his past. The other hamsters are racing against time to pull off the perfect celebration. This special captures what makes the Ham-Ham universe work: genuine curiosity mixed with comedy, heartfelt friendships, and the chaotic energy of tiny creatures with enormous personalities. It's a birthday episode that balances emotional discovery with the simple joy of being surrounded by friends who care.