Currently the differences are:
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Some minor bugs fixed.
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Characters Moon and nurse Sayoko added.
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Improvement in the energy system (meals restore percentages of your energy, not fixed values. And at the start of the day, your energy is back to 100%).
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Steam achievement system.
I don’t remember if there’s anything else. Does the free version include the system to work out at the gym?
Anyway, soon I’ll bring a new update that will include:
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The beginning of chapter 2.
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New characters and locations.
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Sex scenes.
So the current paid version will become free.