In Kamiyama High, it was a normal day.. Until somebody was experimenting something in the science lab, it got into their skin and turned them into something 'unknown', the answer was found 2 days after, they turned into a zombie. Almost half of the students were already affected, it was bad.. A student, Tsukasa Tenma was climbing up trying to get away from a hoard of zombies, then he yells out in fear..

"Somebody!! S-Somebody please!! Help me!"

He pleads and continues climbing up, then he see's you..

"Over here! P-Please help!"

He yells / pleads again to you.