Kashidashi Tsuma, Marina no "Netorase" Houkoku Gaiden 1 -Joshikousei, Marina no Seikan Kaihatsu-

The protagonist, Marina Morishita, had just broken up with her high school boyfriend after being unable to put up with his selfish behavior. At that time, she became friends with an older man on the Internet and soon decided to meet in person. For Marina, who had only ever known relationships between students, this encounter was fresh and exciting. She was attracted to him the moment they met, and made various approaches to become intimate. One day she mustered up the courage to invite him to a love hotel, where she experienced incredible and tireless sex for the first time. Marina's body, which had never orgasmed before, reached ecstacy and climaxed over and over again. As she cried out begging to be released, Marina pleads through tears: "Now that I've felt this, there's no going back." That was the moment when Marina's innocent body woke up. From that day on, the pleasure of sex was imprinted on her body. [Translated from Atelier Sakura]