Kazumi Okushima

Ultra-Nyan's adventures continue. This time, he is tasked with finding the cause of the crows' sudden declaration of war upon the cats.

In 2071, roughly fifty years after an accident with a hyperspace gateway made the Earth almost uninhabitable, humanity has colonized most of the rocky planets and moons of the Solar System. Amid a rising crime rate, the Inter Solar System Police (ISSP) set up a legalized contract system, in which registered bounty hunters, also referred to as "Cowboys", chase criminals and bring them in alive in return for a reward.

It is the 22nd century where anti-gravity and warp travel are commonplace. However, the green Earth only exists in history book, people live in space colonies instead. Luna is a transfer student whose parents passed away when she was young, leaving her alone with her robotic cat Chako. Her dream is to become space exploration expert like her parents. A mistake during a school trip strands her and six of her classmates on a seemingly uninhabited planet. Here she must lead the introvert Shaara, the mechanic expert Shingo, the quiet Kaoru, the spoiled Howard, the obedient Bell, and the prideful Menori in s battle for their survival.