My Vampire Older Sister and Zombie Little Sister by Kazuma Kamachi

Translated from Japanese Action Comedy Virtual Reality Science Fiction
“If a zombie and vampire went all out, which one would win?”
Those fateful words began a serious sisterly fight between zombie little sister Ayumi and vampire older sister Erika.
The entire city has been recreated using the environment simulator created by the main character and a virtual horror movie begins with the fleeing residents as the targets!
Characters:
Ayumi: Zombie girl.
Erika: Vampire girl.
Satori: High school boy with a zombie little sister and vampire older sister.
Maxwell: Support program developed by Satori.

Alternative names : My Vampire Older Sister and Zombie Little Sister Have Gotten Into a Pretty Serious Fight…Only in Virtual Reality Though

1: My Vampire Older Sister and Zombie Little Sister