Villain Was Destined To DIE In A Dating Sim, So He Hid In A Dungeon And Stole All SSS Heroines

What the story is about

Reincarnated into a yuri dating sim as Greg Sass, the sole male character doomed to die in countless routes, he hides in a dungeon and uses his game knowledge and strange new powers to survive. When heroines and other unexpected visitors disrupt his plan, Greg is pulled into the story while trying to avoid death flags and make sense of his bond with the goddess Nightmare.