from I Am the Hero, and the Demon King Is Also Me
Berta is Alfin's maid. She came with her master Alfin in Tsugari's world to convince him to become the Hero in her world, as he was chosen since he is the son of the former Hero. She has black hair, wears a maid uniform and glasses.
I Am the Hero, and the Demon King Is Also Me
Combines the legend of a demon king with a hero who crosses over time and other things. Involves traveling between a Japanese living room and another world.
