Every year during summer vacation, Riku-kun heads to his grandfather's place in the countryside 
There his female friend Nacchan comes over to say hi and play with him every year. 
A year has passed since they last met, and Nacchan has become very attractive... 
Nacchan doesn't act any differently, and she gets nice up and close with Riku-kun. 
His heart is racing with excitement. 
On the other hand, Nacchan is attracted to Riku-kun's new found manliness... 
and eventually the two childhood friends cross the line and go all the way.

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