Summoning: to Fight the Zombie Army, Do You Summon a Succubus?

Brahma is a summoner One day, the umbrella company's virus leaked The whole world is infected with zombie virus What should I do if I am surrounded by an army of zombies? "Don't worry, wait until I'm summoned" Huh? Succubus? Etc! There are a bunch more? Survive like this Unexpectedly discovered the secret of the connection between the two worlds In the end, it is Brahma who saves the world. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.