Because of family troubles, Yuuta, a young boy, had to move to another city.
Changing schools and having perverted teachers might have left him a bit confused, but thanks to the new friends he has made, he believes he can make it.
Then, one day, a friend of his older sister, Chinami, came to his house to play.
Chinami, while a bit troubling, is a quite stimulating young woman...
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This is the story of a young boy named Yuuta who has just transferred to another school and is trying to live a normal life.
However, one day, a mysterious letter Yuuta receives a strange, mysterious letter. It seems someone named Princess Alice sent it!
According to the rumors, she gives to those she has invited the 'ultimate pleasure'!?