Nonohara Yuzuka no Himitsu no Haishin

This is an anime adaptation of the Doujinshi of Laminaria.

Yuka Nonohara is a young woman suffering from social isolation. However, despite appearances, Yuka is a perverse who loves to indulge in pleasures alone in front of spectators on the internet. One day, she finds a letter in her locker containing screenshots of her streams. The sender of the letter blackmails Yuka, by threatening to reveal her identity to her entire school if she does not accept that the latter records her while she gets pleasure alone.