| These testers have lost most of their memories and only a few pieces remained | 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 |
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| There is only one target for all of them: stay alive! However, these are not important |
A group of people from different background and classes were brought to an isolated island by a mysterious organization called 'FF'.
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