Toaru Majutsu no Index: New Testament - Volume 17, Prologue: Or the Assumptions Include the Conclusion - to_the_Girl’s_ABYSS.

In a romance novel called “The Secret Lovers of the Academy” the male lead would often torment his fiancée–but wait, why did she cross into this world to become his fiancée, the villainess, instead of the heroine?

As a cultivation genius who has achieved a new realm every two years since he was a year old, Wang Ling is a near-invincible existence with prowess far beyond his control. But now that he’s sixteen, he faces his greatest battle yet – Senior High School. With one challenge after another popping up, his plans for a low-key high school life seem further and further away…

Xu Xiang is a doomsday survivor who survived for forty years. Before she could fulfill her dream of becoming the overlord, she died.Opening her eyes, she returned to the fifteen years before the doomsday began. With the help of her family heirloom the dragon and phoenix ring, she hoards supplies and prepares to welcome the doomsday.Unfortunately, she was betrayed by her own family and died the night before the doomsday begins. With hatred in her heart, she swallowed the dragon and phoenix ring and jumped off the cliff.When she opened her eyes again, she was still alive, but arrived in a world that was plagued by endless wars and constant natural disasters. Although she's lucky enough to get another chance, she's unknowingly drawn into political turmoil where someone may be killed without knowing who the killer is.Can she survive in this ancient world that is more dangerous and full of hidden dangers than her own? Can she find the courage to trust someone else again? After two lifetimes, can she find her own happiness?

mc gets transmigrated to Fallout New Vegas with the merchant system. let the questionable adventure begin.