Basically the main character is a hero who has beaten the Demon King, Satan. But he will struggle against the uber powerful and sexy girls he will face off in this game, which means that they are all at least the equal of someone who has bested the Demon King. I would expect, unless you read the hints (from the cats), that you will not beat most of them the first time.
There are two chapters to it. The first chapter says Test while the second says CP2.
Enjoy and let me know which is your favourite girl to get destroyed by.
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