I'm a High School Boy and a Bestselling Light Novel Author, Strangled by My Female Junior and a Voice Actress - Volume 3, Chapter 6-2 - June 19, I strangled him

After 2000 years has passed, the ruthless demon lord has just been reincarnated! But his aptitude at an academy for nurturing candidates for demon lords is, “Inept”!?

Chi Xiaochi: fourth-rate citizen at birth, three-time award-winning film emperor, second-rate temper, first-class looks. He crawled his way out of hell on hard mode to become a winner at life.

After getting betrayed and killed by the only person she’d loved, Miss Shang wakes up in the body of the cowardly crown prince Shang Wuxin, who, due to her own circumstances, was actually a girl cross-dressing as a boy. After inheriting the crown prince’s memories, Shang Wuxin has three things on her agenda:

1. Clean up the house

2. Gather loyal followers and soldiers

3. Get the throne

- Description from Novelupdates