One clue could be the candles on chiku.exe's cake, counting 19, it could be September 19 or not
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Wait a little minute here, we can't be sure on that after what happen with the Christmas special part 2 i don't think fatal fire studio will give use a "date" when it will be release my guest it will be available around the end of September or October (if there are any problem) we have to wait and see as the guy above mention.