Tezuka Lion Book Series Episode 7: The Green Cat

This is the first in the series. Ban Shunsaku co-manages a shop with his friend Yushi in the US. One day, Yushi is killed by a gang, and Ban Shunsaku takes his bereaved son Sango over to bring him up. Ban, who is going back to Japan, witnesses a flying saucer. Immediately after that, a green cat appears before Sango.