Tomoo Yokoyama: 3 books

In the land of Glengard, the realm's 666th Demon King, Fienalia Glengard Flamveil...is bored. With no challenges to excite her and all of humanity long since subjugated, she's off to find a new world--any world!--to conquer...and it just so happens that Earth is next on the hit list! But when "Ena-sama"...

While Ena-sama may have found a new pastime learning to become a manga artist, Kento's life has grown considerably more difficult. Keeping a Demon King preoccupied to distract her from destroying the world is no small chore, after all, and now a "hero" has shown up ready to take his head...

Kento's peaceful days slip further and further away as the fun with Ena-sama continues. Between summoning giant beasts and bloody battles in an apartment building, has the path to becoming a mangaka ever been so complicated?!