When the Clock Strikes Z Series by Ichirou Sakaki, 榊一郎

When hardcore FPS enthusiast Hiroaki Dewa pulls off his VR headset and steps outside for the first time in ages, he realizes that the whole world is in ruins! Soon after, he coincidentally runs into horror junkie Otoha Judou, and the two of them team up to endure the zombie apocalypse. One fateful night, a VR AI known as “Raven” leaves them a cryptic message: “Survive, and humanity may flourish once again.” Follow these ragtag oddballs as they cling to hope in a hopeless world!

Hiroaki and the gang roam the city, gathering all sorts of supplies in order to survive in their zombie-infested world. Along the way, they stumble across a wheelchair-bound girl by the name of Shiiko, and she informs them that there’s a way for humanity to flourish once again. Zombie origins, humanity’s salvation, and the AI known as Raven—find out how all these plot points intertwine as the happiest of happy endings creeps over the horizon!