Undead Lovers

In a distant future, a zombie infection spreads internationally and the world is nearing a full-blown apocalypse.You, the heroine, are part of a group being lead by Tsubasa Kisora and are surviving. James, a new comer, and researcher apparently has save the day, after Tsubasa and Jack got bitten one day; but the researcher has his own goal and what is the destiny of your team?