She's a Pervert & She's All Mine Part 1

The story centers on a young man and his girlfriend, the daughter of an elite family who attends a prestigious girls' school. They met in the library and began a dating relationship. The man soon uncovers his girlfriend's secret life. Initially, he thought she was simply desperate to urinate, but he was shocked to find her masturbating in the park. He discovers she regularly engages in this behavior, using porn magazines for stimulation. The anime explores the hidden desires and unconventional activities of the girlfriend, contrasting her public persona with her private indulgences.