The events of this story are unfolding in the near future. Corporations working in the field of medicine actively conduct the experiments on animals. A small part of these animals survive and return to their habitat. Good intellectual abilities appeared in some of them.
The environmental crisis is occurring everywhere because of the irresponsible activities of mankind. Due to the accident at chemical plant, Lukas' otto looses all his family. As a young man, he was also a test animal in one of the medical laboratories, but he miraculously returned to his native river. Having a good reaction and high intelligence, he goes to take revenge on his enemies.

Stats:
- 2 types of weapons
- 6 types of enemies
- 5 bosses and 1 prize boss