If you're looking for anime similar to Hamtaro Movie 2: Ham Ham Ham~Jya! Maboroshi no Princess, you might like these titles.
Baja was spending happy days with his friend Gar at KOHATA Anime Studio. One day, Baja heard people in the studio talking about the sea. On that night, "comet witch" Coco let Baja see the sea by magic. Baja was impressed with the blue sea where various creatures live. But masked wizard Ghee throws Baja's precious friend Gar into a pitch black sea by magic, saying that "I will let you know the true sea."
The story centers on Baja, who came to its current home when it was small, but it doesn't remember much about what happened before it arrived at its current home. Baja's current home is at the KOHATA Anime Studio, where the staff make anime works filled with dreams. Baja also has its friend, who is a duck. Every day is peaceful and fun. But one night, people start disappearing from the studio. And suddenly, a drawing attacks Baja's duck friend. The anime follows Baja's strange night adventure.