Osamu Ichikawa

When her grandmother goes away on a trip, 7-year-old Mimiko stays at home by herself in her small, friendly village, unafraid of burglars. When she arrives back home from the train station where she saw her grandmother off, she discovers she has a visitor-a baby panda. (imdb)

A giant space ship carries human refugees back to earth while being chased by giant humanoids.

The circus comes to town and Mimiko and the Pandas make friends with a tiny tiger.

Waniida from Black Satan attacks a young boy and long-time Kamen Rider ally Tobei Tachibana, but Kamen Rider Stronger and Electro Wave Human Tackle run in to make the save. However, Shigeru and Yuriko fall into separate traps and are captured by Black Satan. Yuriko fights for her life as Shigeru is brainwashed by the organization.