Ai Suru Kanojo wa Gamen no Naka, Hoka no Otoko no Ue de Koshi o Furu ~You-kya no Douga Haishinsha ni Netorareta Ota Kanojo~

The protagonist begin to like a online streamer, then he begin to communicate with her online and give to her tips of how get more viewers. This is just a online friendship. After some time she disappear online, and then, by coincidence, he found out some porn videos of her in other online site.