This Isn't an E*otic Game? - Chapter 82: Department Operarium (departement Operarium)

After getting forcefully reincarnated into a world of an otome game he has no clue about, the protagonist is then killed and brought back to life by the prideful villainess with one desire.

To rule the world.

As the ruthless girl’s Eternal Servant, how will he dodge the fate that the game system has in store for him?

Arthur Ventrike, a genius second-year at the prestigious Wolkan Royal Academy, hailed to be the most talented in his generation, reaches the Swordsman stage of Knight at just 15 under Grandmaster Thorne Bladesong. But envy strikes when a fifth-year student tries to poison him. Though the plot fails, Arthur is left crippled, his dreams shattered. Just when all hope seems lost, he inherits a Great Sage’s legacy and sets out to become the greatest wizard along with the blessing of an indecent goddess and save the world from an ancient evil.

Mo Ran felt that taking Chu Wanning as his master was a mistake.

Welcome to Freia. A continent where evil magi ruled. Until firearms came, that is. Now the people live free of those demons…

More, however, must lurk beneath the surface.

Claude, a transmigrator from another world, finds himself in the midst of this changing world, attending ‘middle school’. Or, as he calls it, ‘boot camp’. His destiny was to graduate and join the military, but the future is seldom so simple.

His life, and the world, is set on the path of upheaval and chaos the day he finds a cookbook.

A magical cookbook.

- Description from novelupdates