If you stop and think about it for a minute, most of Osamu Tezuka's stuff is a little bit out there. As in, some pretty unusual premises to get the story going. But this short little one-shot story takes that one extra step. Alien green cats befriending and twisting young children? Yeah, that's pretty weird. But, whatever, anime is filled with some of the strangest story concepts out there. Let's roll with it. They really crammed this story into as short a time as possible, with lots of very quickcuts and time skips. The artwork is perfectly fine, on par with what you might come to expect from any other Tezuka work. The plot, well, it's a quick story, and not a particularly interesting one at that. With the quick pace of the storytelling, it just sort of rolls past, and before you know it, the tanks are rolling home, and it's over.