Kazumi Okushima

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.

With his stepmother dead, and his father transferred to another city, Yuto is living alone with his ample-bosomed step sister Erika. Temptation soon gets the best of them and they start indulging their forbidden passions. They also attend the same university and it’s not long before their equally ample-bosomed music teacher, Sayaka, discovers their taboo relationship. Sayaka begins falling love with Yuto and threatens to reveal his secret if he does not succumb to her needs. This twisted love triangle spells nothing but trouble and is bound for a surprising finale…

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