According to http://www.dlsite.com/ecchi-eng/work/=/product_id/RE207339.html
Nowadays, an SNS "Lovey Dovey" is getting popular among girls. Originally it was released as a place to show off lovey-dovey with BF, recently there is increase in users who upload sexual materials.
The protagonist Satoshi uses childhood friend Mizuho's risky posts as fap materials. But one day, Mizuho found a boyfriend.
While Satoshi has jealous mind, he is looking forward to seeing videos of her sex with the boyfriend.
But she deleted the account on the SNS all of a sudden. As Satoshi's demands to see her sex loses its focus, he starts stalking her in search of peeping chance...