She dumped her gloomy, beautiful girlfriend and was subjected to a wild, orgy and "training" by her seniors. (Ozaki Erika ROYD-121)

My first girlfriend, though somewhat unremarkable, was pretty and gentle, a girlfriend I was very proud of. During our busy job search, on our long-awaited date, our first sexual encounter ended in failure. Even so, she didn't change her attitude and remained as good to me as ever. But... after I started drinking with a former colleague, she started acting strangely. She became increasingly alluring, increasingly refined... Watching her grow more and more beautiful each day, bad thoughts began to creep into my mind...