A group of people from different background and classes were brought to an isolated island by a mysterious organization called "FF". They were told only 1 people can leave this island alive.Some of them were kidnapped by FF, some of them were attracted by FF's bounty game FF treats everybody as a tester, hypnotize them, brainwash them and genetically modified them. These testers have lost most of their memories and only a few pieces remained.However, these are not important. There is only one target for all of them: stay alive!