From the sight of the sun beaming through the bright blue sky to the smell of green grass to the sound of hot, sweaty sex, summer carries a lot of memories. When Keito goes back to his hometown in the countryside for the first time in years, he's met with those memories in the flesh — his two childhood friends, Suiren and Aoi, but this time, they might want to be more than friends...

Summer is starting to heat up, and the intense heat may melt away the bonds of friendship and turn them into something more carnal. With Keito and Aoi all over each other, it was only a matter of time before the older sister, Suiren, found out. The only question now is whether she will stay faithful to her husband-to-be or cave to Keito's large, throbbing cock.

Unable to keep their hands off each other after confessing their mutual love, Keito and Suiren are spending the hot summer days having sex at all times and in all places. The only thing lingering in the air other than the smell of sweat and bodily fluids is Suiren's engagement, and Keito might have to make her moan to get the truth.

Just when Keito was enjoying his relaxing summer days in the countryside having sex with the two sisters next door, their mom shows up. The mom that's just as beautiful as her daughters and that Keito has had a crush on since he was a kid. And while she might want to punish him for ruining her daughter's engagement, the heat of the summer has a way of getting to everyone.