Immoral Visit -Roshutsu Kairaku ni Mezamete Iku Shoujo-

An ordinary young girl saw some kids playing naked in the park during the blazing summer heat. "That looks like it feels good," she said, but couldn't strip naked just then. She came back after dark. Nude in the evening cool, her body experienced a pleasure unlike any before.

Exhibitionist Nano gets naked at school, all around campus, masturbating, etc.

[From DLsite English]