This is the OVA of The Galaxy Railways. The Galaxy Express 999 crashes on the off-limits planet of Herise and it's up to the SDF Sirius Platoon to assist. (Source: Wikipedia)

It follows the story of a fairy named Mi who is sent to Planet Pandasia to warn the residents about a great evil that threatens to destroy Pandasia. She chooses a heroic panda named Toby to defeat Gold and Silver, two villains who want to collect the seven Beans of Power and rid Pandasia of its colorful, beautiful environment and replace it with a dark wasteland. (Source: Wikipedia)

During her summer holiday at her grandparents house Tamai Shiina, a young and cheerful schoolgirl, meets a strange looking creature. They befriend each other and Shiina names it Hoshimaru: The Round Star. When Shiina returns home after the summer to go back to school, she starts meeting other kids that also have befriended a strange creature like Hoshimaru. But she soon finds out that not all these creatures and their masters are as friendly as Hoshimaru. (Source: ANN)

Second season.