The Emperor and the Knightess - Chapter 324

Back in 1998, an ordinary person who has been through, tired, cried, and fought, hopes to run down-to-earth and keep up with the trend of the times.

- Description from novelbuddy

When Li Shen’s second personality acts out, her consciousness is sent to a strange place called Split Zone No.13. She is then informed that she can only return home after unraveling the truth.

The Invincible Immortal Emperor reincarnates, taking over the body of a student at the Huaxia Medical College. He displays extraordinary skills both in combat and medicine.In his previous life, he was the undefeated War Emperor and the supreme master of medicine. Yet, he found himself ensnared in the mundane affairs of the world, confronted by endless temptations.Would he lose himself to these temptations or remain steadfast in his principles? Would he succumb to despair and decadence, sinking into oblivion, or would he rise with strength and resilience, reversing the course of destiny?As he sets forth on his path to reclaim his status as the Immortal Emperor, he vows to make the ghosts and gods of the myriad realms tremble in fear!

A continuation from where High School DxD Volume 25 left off.